401000557 has 2 divisors, whose sum is σ = 401000558. Its totient is φ = 401000556.

The previous prime is 401000549. The next prime is 401000627. The reversal of 401000557 is 755000104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 379041961 + 21958596 = 19469^2 + 4686^2 .

It is a cyclic number.

It is not a de Polignac number, because 401000557 - 2³ = 401000549 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401003557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200500278 + 200500279.

It is an arithmetic number, because the mean of its divisors is an integer number (200500279).

Almost surely, 2^401000557 is an apocalyptic number.

It is an amenable number.

401000557 is a deficient number, since it is larger than the sum of its proper divisors (1).

401000557 is an equidigital number, since it uses as much as digits as its factorization.

401000557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 401000557 is about 20024.9983021223. The cubic root of 401000557 is about 737.4201354482.

The spelling of 401000557 in words is "four hundred one million, five hundred fifty-seven", and thus it is an aban number.