31031390139 has 8 divisors (see below), whose sum is σ = 41379086160. Its totient is φ = 20685643776.

The previous prime is 31031390111. The next prime is 31031390141. The reversal of 31031390139 is 93109313013.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31031390139 - 2⁵ = 31031390107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31031390149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 449862 + ... + 514235.

It is an arithmetic number, because the mean of its divisors is an integer number (5172385770).

Almost surely, 2^31031390139 is an apocalyptic number.

31031390139 is a deficient number, since it is larger than the sum of its proper divisors (10347696021).

31031390139 is a wasteful number, since it uses less digits than its factorization.

31031390139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974829.

The product of its (nonzero) digits is 6561, while the sum is 33.

The spelling of 31031390139 in words is "thirty-one billion, thirty-one million, three hundred ninety thousand, one hundred thirty-nine".