251123404231 has 4 divisors (see below), whose sum is σ = 286998176272. Its totient is φ = 215248632192.

The previous prime is 251123404229. The next prime is 251123404247. The reversal of 251123404231 is 132404321152.

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

It is a cyclic number.

It is not a de Polignac number, because 251123404231 - 2¹ = 251123404229 is a prime.

It is a super-2 number, since 2×251123404231² (a number of 24 digits) contains 22 as substring.

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 251123404231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251123408231) 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, 17937386010 + ... + 17937386023.

It is an arithmetic number, because the mean of its divisors is an integer number (71749544068).

Almost surely, 2^251123404231 is an apocalyptic number.

251123404231 is a deficient number, since it is larger than the sum of its proper divisors (35874772041).

251123404231 is an equidigital number, since it uses as much as digits as its factorization.

251123404231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35874772040.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 251123404231 its reverse (132404321152), we get a palindrome (383527725383).

The spelling of 251123404231 in words is "two hundred fifty-one billion, one hundred twenty-three million, four hundred four thousand, two hundred thirty-one".