6139931 has 4 divisors (see below), whose sum is σ = 7017072. Its totient is φ = 5262792.

The previous prime is 6139921. The next prime is 6139937. The reversal of 6139931 is 1399316.

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

It is a cyclic number.

It is not a de Polignac number, because 6139931 - 2²² = 1945627 is a prime.

It is a super-2 number, since 2×6139931² = 75397505369522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6139937) 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, 438560 + ... + 438573.

It is an arithmetic number, because the mean of its divisors is an integer number (1754268).

Almost surely, 2^6139931 is an apocalyptic number.

6139931 is a deficient number, since it is larger than the sum of its proper divisors (877141).

6139931 is an equidigital number, since it uses as much as digits as its factorization.

6139931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877140.

The product of its digits is 4374, while the sum is 32.

The square root of 6139931 is about 2477.8884155668. Note that the first 3 decimals coincide. The cubic root of 6139931 is about 183.1138372210.

The spelling of 6139931 in words is "six million, one hundred thirty-nine thousand, nine hundred thirty-one".