401430251 has 2 divisors, whose sum is σ = 401430252. Its totient is φ = 401430250.

The previous prime is 401430223. The next prime is 401430259. The reversal of 401430251 is 152034104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401430251 - 2²² = 397235947 is a prime.

It is a super-2 number, since 2×401430251² = 322292492835846002, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (401430259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200715125 + 200715126.

It is an arithmetic number, because the mean of its divisors is an integer number (200715126).

Almost surely, 2^401430251 is an apocalyptic number.

401430251 is a deficient number, since it is larger than the sum of its proper divisors (1).

401430251 is an equidigital number, since it uses as much as digits as its factorization.

401430251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 401430251 is about 20035.7243692361. The cubic root of 401430251 is about 737.6834367414.

Adding to 401430251 its reverse (152034104), we get a palindrome (553464355).

The spelling of 401430251 in words is "four hundred one million, four hundred thirty thousand, two hundred fifty-one".