401508491 has 2 divisors, whose sum is σ = 401508492. Its totient is φ = 401508490.

The previous prime is 401508487. The next prime is 401508529. The reversal of 401508491 is 194805104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401508491 - 2² = 401508487 is a prime.

It is a super-2 number, since 2×401508491² = 322418136690194162, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (401508461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200754245 + 200754246.

It is an arithmetic number, because the mean of its divisors is an integer number (200754246).

Almost surely, 2^401508491 is an apocalyptic number.

401508491 is a deficient number, since it is larger than the sum of its proper divisors (1).

401508491 is an equidigital number, since it uses as much as digits as its factorization.

401508491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 401508491 is about 20037.6767864940. The cubic root of 401508491 is about 737.7313592241.

The spelling of 401508491 in words is "four hundred one million, five hundred eight thousand, four hundred ninety-one".