31987674469 has 2 divisors, whose sum is σ = 31987674470. Its totient is φ = 31987674468.

The previous prime is 31987674461. The next prime is 31987674473. The reversal of 31987674469 is 96447678913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18753933025 + 13233741444 = 136945^2 + 115038^2 .

It is a cyclic number.

It is not a de Polignac number, because 31987674469 - 2³ = 31987674461 is a prime.

It is a super-2 number, since 2×31987674469² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31987674469.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31987674461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15993837234 + 15993837235.

It is an arithmetic number, because the mean of its divisors is an integer number (15993837235).

Almost surely, 2^31987674469 is an apocalyptic number.

It is an amenable number.

31987674469 is a deficient number, since it is larger than the sum of its proper divisors (1).

31987674469 is an equidigital number, since it uses as much as digits as its factorization.

31987674469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54867456, while the sum is 64.

The spelling of 31987674469 in words is "thirty-one billion, nine hundred eighty-seven million, six hundred seventy-four thousand, four hundred sixty-nine".