251133041551 has 16 divisors (see below), whose sum is σ = 288352124928. Its totient is φ = 214250068800.

The previous prime is 251133041543. The next prime is 251133041563. The reversal of 251133041551 is 155140331152.

It is a cyclic number.

It is not a de Polignac number, because 251133041551 - 2³ = 251133041543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251133041581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10166946 + ... + 10191616.

It is an arithmetic number, because the mean of its divisors is an integer number (18022007808).

Almost surely, 2^251133041551 is an apocalyptic number.

251133041551 is a deficient number, since it is larger than the sum of its proper divisors (37219083377).

251133041551 is a wasteful number, since it uses less digits than its factorization.

251133041551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31422.

The product of its (nonzero) digits is 9000, while the sum is 31.

The spelling of 251133041551 in words is "two hundred fifty-one billion, one hundred thirty-three million, forty-one thousand, five hundred fifty-one".