251544000551 has 4 divisors (see below), whose sum is σ = 251545364400. Its totient is φ = 251542636704.

The previous prime is 251544000541. The next prime is 251544000553. The reversal of 251544000551 is 155000445152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251544000551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251544000553) 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 3 ways as a sum of consecutive naturals, for example, 352091 + ... + 791868.

It is an arithmetic number, because the mean of its divisors is an integer number (62886341100).

Almost surely, 2^251544000551 is an apocalyptic number.

251544000551 is a deficient number, since it is larger than the sum of its proper divisors (1363849).

251544000551 is a wasteful number, since it uses less digits than its factorization.

251544000551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363848.

The product of its (nonzero) digits is 20000, while the sum is 32.

The spelling of 251544000551 in words is "two hundred fifty-one billion, five hundred forty-four million, five hundred fifty-one", and thus it is an aban number.