251351550231 has 4 divisors (see below), whose sum is σ = 335135400312. Its totient is φ = 167567700152.

The previous prime is 251351550223. The next prime is 251351550251. The reversal of 251351550231 is 132055153152.

It is a happy number.

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 251351550231 - 2³ = 251351550223 is a prime.

It is a super-2 number, since 2×251351550231² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 251351550192 and 251351550201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251351550251) 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, 41891925036 + ... + 41891925041.

It is an arithmetic number, because the mean of its divisors is an integer number (83783850078).

Almost surely, 2^251351550231 is an apocalyptic number.

251351550231 is a deficient number, since it is larger than the sum of its proper divisors (83783850081).

251351550231 is an equidigital number, since it uses as much as digits as its factorization.

251351550231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83783850080.

The product of its (nonzero) digits is 22500, while the sum is 33.

The spelling of 251351550231 in words is "two hundred fifty-one billion, three hundred fifty-one million, five hundred fifty thousand, two hundred thirty-one".