31100139 has 32 divisors (see below), whose sum is σ = 53568000. Its totient is φ = 17464032.

The previous prime is 31100101. The next prime is 31100149. The reversal of 31100139 is 93100113.

It is not a de Polignac number, because 31100139 - 2⁷ = 31100011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31100149) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9757 + ... + 12545.

It is an arithmetic number, because the mean of its divisors is an integer number (1674000).

Almost surely, 2^31100139 is an apocalyptic number.

31100139 is a deficient number, since it is larger than the sum of its proper divisors (22467861).

31100139 is a wasteful number, since it uses less digits than its factorization.

31100139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2864 (or 2858 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 18.

The square root of 31100139 is about 5576.7498599094. The cubic root of 31100139 is about 314.4759540576.

The spelling of 31100139 in words is "thirty-one million, one hundred thousand, one hundred thirty-nine".