139311431 has 8 divisors (see below), whose sum is σ = 162600960. Its totient is φ = 116868888.

The previous prime is 139311353. The next prime is 139311451. The reversal of 139311431 is 134113931.

139311431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 139311431 - 2¹⁰ = 139310407 is a prime.

It is a super-2 number, since 2×139311431² = 38815349614535522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139311431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139311451) 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, 211391 + ... + 212048.

It is an arithmetic number, because the mean of its divisors is an integer number (20325120).

Almost surely, 2^139311431 is an apocalyptic number.

139311431 is a deficient number, since it is larger than the sum of its proper divisors (23289529).

139311431 is an equidigital number, since it uses as much as digits as its factorization.

139311431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423493.

The product of its digits is 972, while the sum is 26.

The square root of 139311431 is about 11803.0263492038. The cubic root of 139311431 is about 518.3967272769.

The spelling of 139311431 in words is "one hundred thirty-nine million, three hundred eleven thousand, four hundred thirty-one".