401864561 has 4 divisors (see below), whose sum is σ = 459273792. Its totient is φ = 344455332.

The previous prime is 401864539. The next prime is 401864591. The reversal of 401864561 is 165468104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 401864561 - 2¹⁰ = 401863537 is a prime.

It is a super-2 number, since 2×401864561² = 322990250775445442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401864531) 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, 28704605 + ... + 28704618.

It is an arithmetic number, because the mean of its divisors is an integer number (114818448).

Almost surely, 2^401864561 is an apocalyptic number.

It is an amenable number.

401864561 is a deficient number, since it is larger than the sum of its proper divisors (57409231).

401864561 is an equidigital number, since it uses as much as digits as its factorization.

401864561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57409230.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 401864561 is about 20046.5598295568. The cubic root of 401864561 is about 737.9493756938.

The spelling of 401864561 in words is "four hundred one million, eight hundred sixty-four thousand, five hundred sixty-one".