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717983380921 = 8473392
BaseRepresentation
bin10100111001010110010…
…01001111010110111001
32112122020111101210200011
422130223021033112321
543230412221142141
61305500443341521
7102605204020342
oct12345311172671
92478214353604
10717983380921
1125754999a984
12b71972218a1
13529230cbc41
1426a718470c9
1513a22c7b881
hexa72b24f5b9

717983380921 has 3 divisors (see below), whose sum is σ = 717984228261. Its totient is φ = 717982533582.

The previous prime is 717983380897. The next prime is 717983380931. The reversal of 717983380921 is 129083389717.

The square root of 717983380921 is 847339.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 717983380921 - 29 = 717983380409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (717983380931) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 423670 + ... + 1271008.

It is an arithmetic number, because the mean of its divisors is an integer number (239328076087).

Almost surely, 2717983380921 is an apocalyptic number.

717983380921 is the 847339-th square number.

717983380921 is the 423670-th centered octagonal number.

It is an amenable number.

717983380921 is a deficient number, since it is larger than the sum of its proper divisors (847340).

717983380921 is an frugal number, since it uses more digits than its factorization.

717983380921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694678 (or 847339 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 58.

The spelling of 717983380921 in words is "seven hundred seventeen billion, nine hundred eighty-three million, three hundred eighty thousand, nine hundred twenty-one".

Divisors: 1 847339 717983380921