31125087 has 16 divisors (see below), whose sum is σ = 52698880. Its totient is φ = 17785656.

The previous prime is 31125071. The next prime is 31125119. The reversal of 31125087 is 78052113.

It is not a de Polignac number, because 31125087 - 2⁴ = 31125071 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31125087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31125007) 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, 82153 + ... + 82530.

It is an arithmetic number, because the mean of its divisors is an integer number (3293680).

Almost surely, 2^31125087 is an apocalyptic number.

31125087 is a deficient number, since it is larger than the sum of its proper divisors (21573793).

31125087 is a wasteful number, since it uses less digits than its factorization.

31125087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164699 (or 164693 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 31125087 is about 5578.9861982263. The cubic root of 31125087 is about 314.5600206613.

The spelling of 31125087 in words is "thirty-one million, one hundred twenty-five thousand, eighty-seven".