31421564 has 12 divisors (see below), whose sum is σ = 55045704. Its totient is φ = 15694224.

The previous prime is 31421561. The next prime is 31421581. The reversal of 31421564 is 46512413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 779 + ... + 7965.

It is an arithmetic number, because the mean of its divisors is an integer number (4587142).

Almost surely, 2^31421564 is an apocalyptic number.

It is an amenable number.

31421564 is a deficient number, since it is larger than the sum of its proper divisors (23624140).

31421564 is a wasteful number, since it uses less digits than its factorization.

31421564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8284 (or 8282 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 31421564 is about 5605.4940906222. The cubic root of 31421564 is about 315.5556297435. Note that the first 3 decimals are identical.

Adding to 31421564 its reverse (46512413), we get a palindrome (77933977).

The spelling of 31421564 in words is "thirty-one million, four hundred twenty-one thousand, five hundred sixty-four".