251316990125 has 12 divisors (see below), whose sum is σ = 313650598716. Its totient is φ = 201049108200.

The previous prime is 251316990073. The next prime is 251316990143. The reversal of 251316990125 is 521099613152.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

251316990125 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 8042143684 + 243274846441 = 89678^2 + 493229^2 .

It is not a de Polignac number, because 251316990125 - 2¹⁶ = 251316924589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5582456 + ... + 5627294.

It is an arithmetic number, because the mean of its divisors is an integer number (26137549893).

Almost surely, 2^251316990125 is an apocalyptic number.

251316990125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251316990125 is a deficient number, since it is larger than the sum of its proper divisors (62333608591).

251316990125 is an frugal number, since it uses more digits than its factorization.

251316990125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89693 (or 44844 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 44.

The spelling of 251316990125 in words is "two hundred fifty-one billion, three hundred sixteen million, nine hundred ninety thousand, one hundred twenty-five".