31320164 has 6 divisors (see below), whose sum is σ = 54810294. Its totient is φ = 15660080.

The previous prime is 31320109. The next prime is 31320173. The reversal of 31320164 is 46102313.

It can be written as a sum of positive squares in only one way, i.e., 27478564 + 3841600 = 5242^2 + 1960^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3915017 + ... + 3915024.

It is an arithmetic number, because the mean of its divisors is an integer number (9135049).

Almost surely, 2^31320164 is an apocalyptic number.

It is an amenable number.

31320164 is a deficient number, since it is larger than the sum of its proper divisors (23490130).

31320164 is a wasteful number, since it uses less digits than its factorization.

31320164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7830045 (or 7830043 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 31320164 is about 5596.4420840388. The cubic root of 31320164 is about 315.2158225328.

Adding to 31320164 its reverse (46102313), we get a palindrome (77422477).

The spelling of 31320164 in words is "thirty-one million, three hundred twenty thousand, one hundred sixty-four".