16401251 has 2 divisors, whose sum is σ = 16401252. Its totient is φ = 16401250.

The previous prime is 16401239. The next prime is 16401257. The reversal of 16401251 is 15210461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16401251 - 2¹⁸ = 16139107 is a prime.

It is not a weakly prime, because it can be changed into another prime (16401257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8200625 + 8200626.

It is an arithmetic number, because the mean of its divisors is an integer number (8200626).

Almost surely, 2^16401251 is an apocalyptic number.

16401251 is a deficient number, since it is larger than the sum of its proper divisors (1).

16401251 is an equidigital number, since it uses as much as digits as its factorization.

16401251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 16401251 is about 4049.8457995336. The cubic root of 16401251 is about 254.0732785039.

The spelling of 16401251 in words is "sixteen million, four hundred one thousand, two hundred fifty-one".