6400131 has 16 divisors (see below), whose sum is σ = 9177600. Its totient is φ = 3954528.

The previous prime is 6400123. The next prime is 6400139. The reversal of 6400131 is 1310046.

It is an interprime number because it is at equal distance from previous prime (6400123) and next prime (6400139).

It is not a de Polignac number, because 6400131 - 2³ = 6400123 is a prime.

It is a super-2 number, since 2×6400131² = 81923353634322, which contains 22 as substring.

6400131 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6400131.

It is not an unprimeable number, because it can be changed into a prime (6400139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1485 + ... + 3873.

It is an arithmetic number, because the mean of its divisors is an integer number (573600).

Almost surely, 2^6400131 is an apocalyptic number.

6400131 is a deficient number, since it is larger than the sum of its proper divisors (2777469).

6400131 is a wasteful number, since it uses less digits than its factorization.

6400131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2458.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 6400131 is about 2529.8480191506. The cubic root of 6400131 is about 185.6648201028.

Adding to 6400131 its reverse (1310046), we get a palindrome (7710177).

The spelling of 6400131 in words is "six million, four hundred thousand, one hundred thirty-one".