31125564 has 36 divisors (see below), whose sum is σ = 79194024. Its totient is φ = 10307232.

The previous prime is 31125529. The next prime is 31125571. The reversal of 31125564 is 46552113.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2899 + ... + 8405.

It is an arithmetic number, because the mean of its divisors is an integer number (2199834).

Almost surely, 2^31125564 is an apocalyptic number.

It is an amenable number.

31125564 is an abundant number, since it is smaller than the sum of its proper divisors (48068460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31125564 is a wasteful number, since it uses less digits than its factorization.

31125564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5674 (or 5669 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 31125564 is about 5579.0289477650. The cubic root of 31125564 is about 314.5616275576.

Adding to 31125564 its reverse (46552113), we get a palindrome (77677677).

The spelling of 31125564 in words is "thirty-one million, one hundred twenty-five thousand, five hundred sixty-four".