251241144193 has 4 divisors (see below), whose sum is σ = 270567386068. Its totient is φ = 231914902320.

The previous prime is 251241144151. The next prime is 251241144241. The reversal of 251241144193 is 391441142152.

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 171306587664 + 79934556529 = 413892^2 + 282727^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251241144193 is a prime.

It is a super-2 number, since 2×251241144193² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251241144293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9663120918 + ... + 9663120943.

It is an arithmetic number, because the mean of its divisors is an integer number (67641846517).

Almost surely, 2^251241144193 is an apocalyptic number.

It is an amenable number.

251241144193 is a deficient number, since it is larger than the sum of its proper divisors (19326241875).

251241144193 is a wasteful number, since it uses less digits than its factorization.

251241144193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19326241874.

The product of its digits is 34560, while the sum is 37.

The spelling of 251241144193 in words is "two hundred fifty-one billion, two hundred forty-one million, one hundred forty-four thousand, one hundred ninety-three".