251591975141 has 4 divisors (see below), whose sum is σ = 270945204012. Its totient is φ = 232238746272.

The previous prime is 251591975123. The next prime is 251591975207. The reversal of 251591975141 is 141579195152.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 152337993025 + 99253982116 = 390305^2 + 315046^2 .

It is not a de Polignac number, because 251591975141 - 2¹⁴ = 251591958757 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251591975141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251591975641) 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, 9676614416 + ... + 9676614441.

It is an arithmetic number, because the mean of its divisors is an integer number (67736301003).

Almost surely, 2^251591975141 is an apocalyptic number.

It is an amenable number.

251591975141 is a deficient number, since it is larger than the sum of its proper divisors (19353228871).

251591975141 is a wasteful number, since it uses less digits than its factorization.

251591975141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19353228870.

The product of its digits is 567000, while the sum is 50.

The spelling of 251591975141 in words is "two hundred fifty-one billion, five hundred ninety-one million, nine hundred seventy-five thousand, one hundred forty-one".