31138732569 has 32 divisors (see below), whose sum is σ = 47698928640. Its totient is φ = 17700242112.

The previous prime is 31138732549. The next prime is 31138732577. The reversal of 31138732569 is 96523783113.

It is not a de Polignac number, because 31138732569 - 2¹¹ = 31138730521 is a prime.

It is a super-2 number, since 2×31138732569² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31138732549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3829342 + ... + 3837464.

It is an arithmetic number, because the mean of its divisors is an integer number (1490591520).

Almost surely, 2^31138732569 is an apocalyptic number.

It is an amenable number.

31138732569 is a deficient number, since it is larger than the sum of its proper divisors (16560196071).

31138732569 is a wasteful number, since it uses less digits than its factorization.

31138732569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9069.

The product of its digits is 816480, while the sum is 48.

The spelling of 31138732569 in words is "thirty-one billion, one hundred thirty-eight million, seven hundred thirty-two thousand, five hundred sixty-nine".