139074631 has 4 divisors (see below), whose sum is σ = 139126264. Its totient is φ = 139023000.

The previous prime is 139074589. The next prime is 139074679. The reversal of 139074631 is 136470931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136470931 = 151 ⋅903781.

It is a cyclic number.

It is not a de Polignac number, because 139074631 - 2⁷ = 139074503 is a prime.

It is a super-2 number, since 2×139074631² = 38683505975572322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139074731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21540 + ... + 27241.

It is an arithmetic number, because the mean of its divisors is an integer number (34781566).

Almost surely, 2^139074631 is an apocalyptic number.

139074631 is a deficient number, since it is larger than the sum of its proper divisors (51633).

139074631 is an equidigital number, since it uses as much as digits as its factorization.

139074631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51632.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 139074631 is about 11792.9907572252. The cubic root of 139074631 is about 518.1028390602.

The spelling of 139074631 in words is "one hundred thirty-nine million, seventy-four thousand, six hundred thirty-one".