251264633 has 2 divisors, whose sum is σ = 251264634. Its totient is φ = 251264632.

The previous prime is 251264621. The next prime is 251264639. The reversal of 251264633 is 336462152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221801449 + 29463184 = 14893^2 + 5428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251264633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251264633.

It is not a weakly prime, because it can be changed into another prime (251264639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125632316 + 125632317.

It is an arithmetic number, because the mean of its divisors is an integer number (125632317).

Almost surely, 2^251264633 is an apocalyptic number.

It is an amenable number.

251264633 is a deficient number, since it is larger than the sum of its proper divisors (1).

251264633 is an equidigital number, since it uses as much as digits as its factorization.

251264633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 32.

The square root of 251264633 is about 15851.3290609967. The cubic root of 251264633 is about 631.0209640221.

The spelling of 251264633 in words is "two hundred fifty-one million, two hundred sixty-four thousand, six hundred thirty-three".