401442251 has 6 divisors (see below), whose sum is σ = 466983900. Its totient is φ = 344093316.

The previous prime is 401442247. The next prime is 401442263. The reversal of 401442251 is 152244104.

It is not a de Polignac number, because 401442251 - 2² = 401442247 is a prime.

It is a super-2 number, since 2×401442251² = 322311761775894002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401442211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4096301 + ... + 4096398.

It is an arithmetic number, because the mean of its divisors is an integer number (77830650).

Almost surely, 2^401442251 is an apocalyptic number.

401442251 is a deficient number, since it is larger than the sum of its proper divisors (65541649).

401442251 is an equidigital number, since it uses as much as digits as its factorization.

401442251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8192713 (or 8192706 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 401442251 is about 20036.0238320880. The cubic root of 401442251 is about 737.6907872197.

Adding to 401442251 its reverse (152244104), we get a palindrome (553686355).

The spelling of 401442251 in words is "four hundred one million, four hundred forty-two thousand, two hundred fifty-one".