31097142 has 32 divisors (see below), whose sum is σ = 69788160. Its totient is φ = 10263240.

The previous prime is 31097137. The next prime is 31097177. The reversal of 31097142 is 24179013.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2767 + ... + 8357.

It is an arithmetic number, because the mean of its divisors is an integer number (2180880).

Almost surely, 2^31097142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31097142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34894080).

31097142 is an abundant number, since it is smaller than the sum of its proper divisors (38691018).

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

31097142 is a wasteful number, since it uses less digits than its factorization.

31097142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5705 (or 5699 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 31097142 is about 5576.4811485380. The cubic root of 31097142 is about 314.4658521230.

The spelling of 31097142 in words is "thirty-one million, ninety-seven thousand, one hundred forty-two".