79754843281 has 3 divisors (see below), whose sum is σ = 79755125691. Its totient is φ = 79754560872.

The previous prime is 79754843237. The next prime is 79754843291. The reversal of 79754843281 is 18234845797.

The square root of 79754843281 is 282409.

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 can be written as a sum of positive squares in only one way, i.e., 7049113681 + 72705729600 = 83959^2 + 269640^2 .

It is a de Polignac number, because none of the positive numbers 2^k-79754843281 is a prime.

It is a super-2 number, since 2×79754843281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79754843291) 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, 141205 + ... + 423613.

It is an arithmetic number, because the mean of its divisors is an integer number (26585041897).

Almost surely, 2^79754843281 is an apocalyptic number.

79754843281 is the 282409-th square number.

79754843281 is the 141205-th centered octagonal number.

It is an amenable number.

79754843281 is a deficient number, since it is larger than the sum of its proper divisors (282410).

79754843281 is an frugal number, since it uses more digits than its factorization.

79754843281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564818 (or 282409 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 58.

The spelling of 79754843281 in words is "seventy-nine billion, seven hundred fifty-four million, eight hundred forty-three thousand, two hundred eighty-one".