1997017345 has 8 divisors (see below), whose sum is σ = 2409661800. Its totient is φ = 1588786560.

The previous prime is 1997017331. The next prime is 1997017361. The reversal of 1997017345 is 5437107991.

It is a Cunningham number, because it is equal to 44688²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 22014864 + 1975002481 = 4692^2 + 44441^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1997017345 - 2¹³ = 1997009153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1997017295 and 1997017304.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1102420 + ... + 1104229.

It is an arithmetic number, because the mean of its divisors is an integer number (301207725).

Almost surely, 2^1997017345 is an apocalyptic number.

It is an amenable number.

1997017345 is a deficient number, since it is larger than the sum of its proper divisors (412644455).

1997017345 is a wasteful number, since it uses less digits than its factorization.

1997017345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206835.

The product of its (nonzero) digits is 238140, while the sum is 46.

The square root of 1997017345 is about 44688.0000111887. Note that the first 4 decimals coincide. The cubic root of 1997017345 is about 1259.2944199849.

It can be divided in two parts, 199701 and 7345, that added together give a triangular number (207046 = T₆₄₃).

The spelling of 1997017345 in words is "one billion, nine hundred ninety-seven million, seventeen thousand, three hundred forty-five".