31140681 has 24 divisors (see below), whose sum is σ = 49156800. Its totient is φ = 17418720.

The previous prime is 31140679. The next prime is 31140727. The reversal of 31140681 is 18604113.

It is not a de Polignac number, because 31140681 - 2¹ = 31140679 is a prime.

It is a super-2 number, since 2×31140681² = 1939484026287522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31140611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1420 + ... + 8018.

It is an arithmetic number, because the mean of its divisors is an integer number (2048200).

Almost surely, 2^31140681 is an apocalyptic number.

It is an amenable number.

31140681 is a deficient number, since it is larger than the sum of its proper divisors (18016119).

31140681 is a wasteful number, since it uses less digits than its factorization.

31140681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6637 (or 6626 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 31140681 is about 5580.3835889659. The cubic root of 31140681 is about 314.6125445305.

Adding to 31140681 its reverse (18604113), we get a palindrome (49744794).

The spelling of 31140681 in words is "thirty-one million, one hundred forty thousand, six hundred eighty-one".