251428633 has 2 divisors, whose sum is σ = 251428634. Its totient is φ = 251428632.

The previous prime is 251428607. The next prime is 251428643. The reversal of 251428633 is 336824152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130142464 + 121286169 = 11408^2 + 11013^2 .

It is a cyclic number.

It is not a de Polignac number, because 251428633 - 2⁵ = 251428601 is a prime.

It is not a weakly prime, because it can be changed into another prime (251428603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125714316 + 125714317.

It is an arithmetic number, because the mean of its divisors is an integer number (125714317).

Almost surely, 2^251428633 is an apocalyptic number.

It is an amenable number.

251428633 is a deficient number, since it is larger than the sum of its proper divisors (1).

251428633 is an equidigital number, since it uses as much as digits as its factorization.

251428633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 34.

The square root of 251428633 is about 15856.5012849620. The cubic root of 251428633 is about 631.1582229347.

The spelling of 251428633 in words is "two hundred fifty-one million, four hundred twenty-eight thousand, six hundred thirty-three".