401520557 has 2 divisors, whose sum is σ = 401520558. Its totient is φ = 401520556.

The previous prime is 401520523. The next prime is 401520571. The reversal of 401520557 is 755025104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 309091561 + 92428996 = 17581^2 + 9614^2 .

It is a cyclic number.

It is not a de Polignac number, because 401520557 - 2²² = 397326253 is a prime.

It is a super-2 number, since 2×401520557² = 322437515387180498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401520157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200760278 + 200760279.

It is an arithmetic number, because the mean of its divisors is an integer number (200760279).

Almost surely, 2^401520557 is an apocalyptic number.

It is an amenable number.

401520557 is a deficient number, since it is larger than the sum of its proper divisors (1).

401520557 is an equidigital number, since it uses as much as digits as its factorization.

401520557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 401520557 is about 20037.9778670404. The cubic root of 401520557 is about 737.7387491694.

The spelling of 401520557 in words is "four hundred one million, five hundred twenty thousand, five hundred fifty-seven".