401502251 has 2 divisors, whose sum is σ = 401502252. Its totient is φ = 401502250.

The previous prime is 401502193. The next prime is 401502287. The reversal of 401502251 is 152205104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401502251 - 2¹⁰ = 401501227 is a prime.

It is a super-2 number, since 2×401502251² = 322408115116134002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401502151) 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, 200751125 + 200751126.

It is an arithmetic number, because the mean of its divisors is an integer number (200751126).

Almost surely, 2^401502251 is an apocalyptic number.

401502251 is a deficient number, since it is larger than the sum of its proper divisors (1).

401502251 is an equidigital number, since it uses as much as digits as its factorization.

401502251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 401502251 is about 20037.5210792154. The cubic root of 401502251 is about 737.7275374141.

Adding to 401502251 its reverse (152205104), we get a palindrome (553707355).

The spelling of 401502251 in words is "four hundred one million, five hundred two thousand, two hundred fifty-one".