31990839469 has 2 divisors, whose sum is σ = 31990839470. Its totient is φ = 31990839468.

The previous prime is 31990839443. The next prime is 31990839533. The reversal of 31990839469 is 96493809913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30845896900 + 1144942569 = 175630^2 + 33837^2 .

It is a cyclic number.

It is not a de Polignac number, because 31990839469 - 2⁵ = 31990839437 is a prime.

It is a super-2 number, since 2×31990839469² (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 (31990939469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15995419734 + 15995419735.

It is an arithmetic number, because the mean of its divisors is an integer number (15995419735).

Almost surely, 2^31990839469 is an apocalyptic number.

It is an amenable number.

31990839469 is a deficient number, since it is larger than the sum of its proper divisors (1).

31990839469 is an equidigital number, since it uses as much as digits as its factorization.

31990839469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11337408, while the sum is 61.

The spelling of 31990839469 in words is "thirty-one billion, nine hundred ninety million, eight hundred thirty-nine thousand, four hundred sixty-nine".