31699525469 has 2 divisors, whose sum is σ = 31699525470. Its totient is φ = 31699525468.

The previous prime is 31699525433. The next prime is 31699525489. The reversal of 31699525469 is 96452599613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26304622969 + 5394902500 = 162187^2 + 73450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31699525469 is a prime.

It is a super-2 number, since 2×31699525469² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31699525489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15849762734 + 15849762735.

It is an arithmetic number, because the mean of its divisors is an integer number (15849762735).

Almost surely, 2^31699525469 is an apocalyptic number.

It is an amenable number.

31699525469 is a deficient number, since it is larger than the sum of its proper divisors (1).

31699525469 is an equidigital number, since it uses as much as digits as its factorization.

31699525469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15746400, while the sum is 59.

The spelling of 31699525469 in words is "thirty-one billion, six hundred ninety-nine million, five hundred twenty-five thousand, four hundred sixty-nine".