251253122142 has 16 divisors (see below), whose sum is σ = 548188630272. Its totient is φ = 76137309720.

The previous prime is 251253122117. The next prime is 251253122149. The reversal of 251253122142 is 241221352152.

It is a super-2 number, since 2×251253122142² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251253122149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1903432678 + ... + 1903432809.

It is an arithmetic number, because the mean of its divisors is an integer number (34261789392).

Almost surely, 2^251253122142 is an apocalyptic number.

251253122142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

251253122142 is an abundant number, since it is smaller than the sum of its proper divisors (296935508130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251253122142 is a wasteful number, since it uses less digits than its factorization.

251253122142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3806865503.

The product of its digits is 9600, while the sum is 30.

Adding to 251253122142 its reverse (241221352152), we get a palindrome (492474474294).

The spelling of 251253122142 in words is "two hundred fifty-one billion, two hundred fifty-three million, one hundred twenty-two thousand, one hundred forty-two".