401287561 has 8 divisors (see below), whose sum is σ = 406425600. Its totient is φ = 396163680.

The previous prime is 401287553. The next prime is 401287573. The reversal of 401287561 is 165782104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 401287561 - 2³ = 401287553 is a prime.

It is a super-2 number, since 2×401287561² = 322063413226657442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401287501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60856 + ... + 67126.

It is an arithmetic number, because the mean of its divisors is an integer number (50803200).

Almost surely, 2^401287561 is an apocalyptic number.

It is an amenable number.

401287561 is a deficient number, since it is larger than the sum of its proper divisors (5138039).

401287561 is an equidigital number, since it uses as much as digits as its factorization.

401287561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7079.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 401287561 is about 20032.1631632732. The cubic root of 401287561 is about 737.5960222001.

The spelling of 401287561 in words is "four hundred one million, two hundred eighty-seven thousand, five hundred sixty-one".