251530122051 has 24 divisors (see below), whose sum is σ = 391661706800. Its totient is φ = 154632442176.

The previous prime is 251530122037. The next prime is 251530122073. The reversal of 251530122051 is 150221035152.

251530122051 is a `hidden beast` number, since 2 + 5 + 1 + 530 + 122 + 0 + 5 + 1 = 666.

It is not a de Polignac number, because 251530122051 - 2⁹ = 251530121539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251530122751) 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 in 23 ways as a sum of consecutive naturals, for example, 961501 + ... + 1194798.

Almost surely, 2^251530122051 is an apocalyptic number.

251530122051 is a deficient number, since it is larger than the sum of its proper divisors (140131584749).

251530122051 is a wasteful number, since it uses less digits than its factorization.

251530122051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157315 (or 2157312 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

It can be divided in two parts, 2515301 and 22051, that added together give a palindrome (2537352).

The spelling of 251530122051 in words is "two hundred fifty-one billion, five hundred thirty million, one hundred twenty-two thousand, fifty-one".