139925931 has 4 divisors (see below), whose sum is σ = 186567912. Its totient is φ = 93283952.

The previous prime is 139925923. The next prime is 139925939. The reversal of 139925931 is 139529931.

139925931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (139925923) and next prime (139925939).

It is a cyclic number.

It is not a de Polignac number, because 139925931 - 2³ = 139925923 is a prime.

It is a super-2 number, since 2×139925931² = 39158532332433522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139925939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23320986 + ... + 23320991.

It is an arithmetic number, because the mean of its divisors is an integer number (46641978).

Almost surely, 2^139925931 is an apocalyptic number.

139925931 is a deficient number, since it is larger than the sum of its proper divisors (46641981).

139925931 is an equidigital number, since it uses as much as digits as its factorization.

139925931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46641980.

The product of its digits is 65610, while the sum is 42.

The square root of 139925931 is about 11829.0291655740. The cubic root of 139925931 is about 519.1578219251.

The spelling of 139925931 in words is "one hundred thirty-nine million, nine hundred twenty-five thousand, nine hundred thirty-one".