31125887 has 4 divisors (see below), whose sum is σ = 33520200. Its totient is φ = 28731576.

The previous prime is 31125883. The next prime is 31125889. The reversal of 31125887 is 78852113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31125887 - 2² = 31125883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31125883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1197137 + ... + 1197162.

It is an arithmetic number, because the mean of its divisors is an integer number (8380050).

Almost surely, 2^31125887 is an apocalyptic number.

31125887 is a deficient number, since it is larger than the sum of its proper divisors (2394313).

31125887 is a wasteful number, since it uses less digits than its factorization.

31125887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394312.

The product of its digits is 13440, while the sum is 35.

The square root of 31125887 is about 5579.0578953798. The cubic root of 31125887 is about 314.5627156563.

The spelling of 31125887 in words is "thirty-one million, one hundred twenty-five thousand, eight hundred eighty-seven".