31997600045 has 6 divisors (see below), whose sum is σ = 38397600042. Its totient is φ = 25597760048.

The previous prime is 31997600027. The next prime is 31997600083. The reversal of 31997600045 is 54000679913.

It can be written as a sum of positive squares in 3 ways, for example, as 689482564 + 31308117481 = 26258^2 + 176941^2 .

It is not a de Polignac number, because 31997600045 - 2⁶ = 31997599981 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31997599969 and 31997600005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 359987 + ... + 439983.

It is an arithmetic number, because the mean of its divisors is an integer number (6399600007).

Almost surely, 2^31997600045 is an apocalyptic number.

It is an amenable number.

31997600045 is a deficient number, since it is larger than the sum of its proper divisors (6399999997).

31997600045 is an frugal number, since it uses more digits than its factorization.

31997600045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159999 (or 80002 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 44.

The spelling of 31997600045 in words is "thirty-one billion, nine hundred ninety-seven million, six hundred thousand, forty-five".