401255251 has 2 divisors, whose sum is σ = 401255252. Its totient is φ = 401255250.

The previous prime is 401255249. The next prime is 401255279. The reversal of 401255251 is 152552104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401255251 - 2¹ = 401255249 is a prime.

It is a super-2 number, since 2×401255251² = 322011552910146002, which contains 22 as substring.

Together with 401255249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (401255551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200627625 + 200627626.

It is an arithmetic number, because the mean of its divisors is an integer number (200627626).

Almost surely, 2^401255251 is an apocalyptic number.

401255251 is a deficient number, since it is larger than the sum of its proper divisors (1).

401255251 is an equidigital number, since it uses as much as digits as its factorization.

401255251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 401255251 is about 20031.3566939436. The cubic root of 401255251 is about 737.5762256174.

The spelling of 401255251 in words is "four hundred one million, two hundred fifty-five thousand, two hundred fifty-one".