139131831 has 16 divisors (see below), whose sum is σ = 188179200. Its totient is φ = 91426368.

The previous prime is 139131827. The next prime is 139131847. The reversal of 139131831 is 138131931.

It is a happy number.

It is not a de Polignac number, because 139131831 - 2² = 139131827 is a prime.

It is a super-2 number, since 2×139131831² = 38715332794825122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139131871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116620 + ... + 117806.

It is an arithmetic number, because the mean of its divisors is an integer number (11761200).

Almost surely, 2^139131831 is an apocalyptic number.

139131831 is a deficient number, since it is larger than the sum of its proper divisors (49047369).

139131831 is a wasteful number, since it uses less digits than its factorization.

139131831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718.

The product of its digits is 1944, while the sum is 30.

The square root of 139131831 is about 11795.4156772875. The cubic root of 139131831 is about 518.1738594905.

The spelling of 139131831 in words is "one hundred thirty-nine million, one hundred thirty-one thousand, eight hundred thirty-one".