6399031 has 2 divisors, whose sum is σ = 6399032. Its totient is φ = 6399030.

The previous prime is 6399023. The next prime is 6399049. The reversal of 6399031 is 1309936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6399031 - 2³ = 6399023 is a prime.

It is a super-2 number, since 2×6399031² = 81895195477922, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6398984 and 6399002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6399091) 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 as a sum of consecutive naturals, namely, 3199515 + 3199516.

It is an arithmetic number, because the mean of its divisors is an integer number (3199516).

Almost surely, 2^6399031 is an apocalyptic number.

6399031 is a deficient number, since it is larger than the sum of its proper divisors (1).

6399031 is an equidigital number, since it uses as much as digits as its factorization.

6399031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 6399031 is about 2529.6306054442. The cubic root of 6399031 is about 185.6541826641.

The spelling of 6399031 in words is "six million, three hundred ninety-nine thousand, thirty-one".