251401133 has 2 divisors, whose sum is σ = 251401134. Its totient is φ = 251401132.

The previous prime is 251401121. The next prime is 251401159. The reversal of 251401133 is 331104152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191462569 + 59938564 = 13837^2 + 7742^2 .

It is a cyclic number.

It is not a de Polignac number, because 251401133 - 2¹⁸ = 251138989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251401333) 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, 125700566 + 125700567.

It is an arithmetic number, because the mean of its divisors is an integer number (125700567).

Almost surely, 2^251401133 is an apocalyptic number.

It is an amenable number.

251401133 is a deficient number, since it is larger than the sum of its proper divisors (1).

251401133 is an equidigital number, since it uses as much as digits as its factorization.

251401133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 251401133 is about 15855.6341090478. The cubic root of 251401133 is about 631.1352111245.

Adding to 251401133 its reverse (331104152), we get a palindrome (582505285).

The spelling of 251401133 in words is "two hundred fifty-one million, four hundred one thousand, one hundred thirty-three".