6401131 has 4 divisors (see below), whose sum is σ = 6983064. Its totient is φ = 5819200.

The previous prime is 6401123. The next prime is 6401149. The reversal of 6401131 is 1311046.

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 6401131 - 2³ = 6401123 is a prime.

It is a super-2 number, since 2×6401131² = 81948956158322, which contains 22 as substring.

6401131 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6401191) 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, 290950 + ... + 290971.

It is an arithmetic number, because the mean of its divisors is an integer number (1745766).

Almost surely, 2^6401131 is an apocalyptic number.

6401131 is a deficient number, since it is larger than the sum of its proper divisors (581933).

6401131 is a wasteful number, since it uses less digits than its factorization.

6401131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581932.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 6401131 is about 2530.0456517620. The cubic root of 6401131 is about 185.6744894440.

Adding to 6401131 its reverse (1311046), we get a palindrome (7712177).

It can be divided in two parts, 640 and 1131, that added together give a palindrome (1771).

The spelling of 6401131 in words is "six million, four hundred one thousand, one hundred thirty-one".