31310661 has 16 divisors (see below), whose sum is σ = 42591744. Its totient is φ = 20456304.

The previous prime is 31310639. The next prime is 31310677. The reversal of 31310661 is 16601313.

It is not a de Polignac number, because 31310661 - 2⁶ = 31310597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31310611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32590 + ... + 33536.

It is an arithmetic number, because the mean of its divisors is an integer number (2661984).

Almost surely, 2^31310661 is an apocalyptic number.

It is an amenable number.

31310661 is a deficient number, since it is larger than the sum of its proper divisors (11281083).

31310661 is a wasteful number, since it uses less digits than its factorization.

31310661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 31310661 is about 5595.5929980655. The cubic root of 31310661 is about 315.1839389303.

Adding to 31310661 its reverse (16601313), we get a palindrome (47911974).

The spelling of 31310661 in words is "thirty-one million, three hundred ten thousand, six hundred sixty-one".