31269681 has 12 divisors (see below), whose sum is σ = 47824452. Its totient is φ = 19620096.

The previous prime is 31269677. The next prime is 31269683. The reversal of 31269681 is 18696213.

It can be written as a sum of positive squares in 2 ways, for example, as 14130081 + 17139600 = 3759^2 + 4140^2 .

It is not a de Polignac number, because 31269681 - 2² = 31269677 is a prime.

It is a super-2 number, since 2×31269681² = 1955585899683522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31269683) 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 11 ways as a sum of consecutive naturals, for example, 102036 + ... + 102341.

It is an arithmetic number, because the mean of its divisors is an integer number (3985371).

Almost surely, 2^31269681 is an apocalyptic number.

It is an amenable number.

31269681 is a deficient number, since it is larger than the sum of its proper divisors (16554771).

31269681 is a wasteful number, since it uses less digits than its factorization.

31269681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204400 (or 204397 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 31269681 is about 5591.9299888321. The cubic root of 31269681 is about 315.0463726136.

The spelling of 31269681 in words is "thirty-one million, two hundred sixty-nine thousand, six hundred eighty-one".