31040663 has 4 divisors (see below), whose sum is σ = 31070928. Its totient is φ = 31010400.

The previous prime is 31040651. The next prime is 31040671. The reversal of 31040663 is 36604013.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31040663 - 2⁸ = 31040407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31040683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13538 + ... + 15663.

It is an arithmetic number, because the mean of its divisors is an integer number (7767732).

Almost surely, 2^31040663 is an apocalyptic number.

31040663 is a deficient number, since it is larger than the sum of its proper divisors (30265).

31040663 is a wasteful number, since it uses less digits than its factorization.

31040663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30264.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 31040663 is about 5571.4148113383. The cubic root of 31040663 is about 314.2753578740.

Adding to 31040663 its reverse (36604013), we get a palindrome (67644676).

The spelling of 31040663 in words is "thirty-one million, forty thousand, six hundred sixty-three".