251136045 has 40 divisors (see below), whose sum is σ = 451734624. Its totient is φ = 133478496.

The previous prime is 251135999. The next prime is 251136047. The reversal of 251136045 is 540631152.

251136045 is a `hidden beast` number, since 2 + 51 + 1 + 3 + 604 + 5 = 666.

It is not a de Polignac number, because 251136045 - 2⁸ = 251135789 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251136047) 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 in 39 ways as a sum of consecutive naturals, for example, 139642 + ... + 141428.

Almost surely, 2^251136045 is an apocalyptic number.

It is an amenable number.

251136045 is a deficient number, since it is larger than the sum of its proper divisors (200598579).

251136045 is a wasteful number, since it uses less digits than its factorization.

251136045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2151 (or 2142 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 251136045 is about 15847.2724782532. The cubic root of 251136045 is about 630.9133012120.

Adding to 251136045 its reverse (540631152), we get a palindrome (791767197).

The spelling of 251136045 in words is "two hundred fifty-one million, one hundred thirty-six thousand, forty-five".