401255551 has 2 divisors, whose sum is σ = 401255552. Its totient is φ = 401255550.

The previous prime is 401255507. The next prime is 401255587. The reversal of 401255551 is 155552104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401255551 - 2¹³ = 401247359 is a prime.

It is a super-2 number, since 2×401255551² = 322012034416627202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401255501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200627775 + 200627776.

It is an arithmetic number, because the mean of its divisors is an integer number (200627776).

Almost surely, 2^401255551 is an apocalyptic number.

401255551 is a deficient number, since it is larger than the sum of its proper divisors (1).

401255551 is an equidigital number, since it uses as much as digits as its factorization.

401255551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 401255551 is about 20031.3641822019. The cubic root of 401255551 is about 737.5764094346.

The spelling of 401255551 in words is "four hundred one million, two hundred fifty-five thousand, five hundred fifty-one".