31129116 has 12 divisors (see below), whose sum is σ = 72634632. Its totient is φ = 10376368.

The previous prime is 31129069. The next prime is 31129141. The reversal of 31129116 is 61192113.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1297035 + ... + 1297058.

It is an arithmetic number, because the mean of its divisors is an integer number (6052886).

Almost surely, 2^31129116 is an apocalyptic number.

It is an amenable number.

31129116 is an abundant number, since it is smaller than the sum of its proper divisors (41505516).

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

31129116 is a wasteful number, since it uses less digits than its factorization.

31129116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594100 (or 2594098 counting only the distinct ones).

The product of its digits is 324, while the sum is 24.

The square root of 31129116 is about 5579.3472736513. The cubic root of 31129116 is about 314.5735928605.

The spelling of 31129116 in words is "thirty-one million, one hundred twenty-nine thousand, one hundred sixteen".