6401731 has 4 divisors (see below), whose sum is σ = 7316272. Its totient is φ = 5487192.

The previous prime is 6401723. The next prime is 6401749. The reversal of 6401731 is 1371046.

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 6401731 - 2³ = 6401723 is a prime.

It is a super-2 number, since 2×6401731² = 81964319592722, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

6401731 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6401761) 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, 457260 + ... + 457273.

It is an arithmetic number, because the mean of its divisors is an integer number (1829068).

Almost surely, 2^6401731 is an apocalyptic number.

6401731 is a deficient number, since it is larger than the sum of its proper divisors (914541).

6401731 is an equidigital number, since it uses as much as digits as its factorization.

6401731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914540.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 6401731 is about 2530.1642239191. The cubic root of 6401731 is about 185.6802905654.

Adding to 6401731 its reverse (1371046), we get a palindrome (7772777).

The spelling of 6401731 in words is "six million, four hundred one thousand, seven hundred thirty-one".