251230543122 has 32 divisors (see below), whose sum is σ = 542746774080. Its totient is φ = 77068157760.

The previous prime is 251230543117. The next prime is 251230543127. The reversal of 251230543122 is 221345032152.

It is an interprime number because it is at equal distance from previous prime (251230543117) and next prime (251230543127).

It is a self number, because there is not a number n which added to its sum of digits gives 251230543122.

It is not an unprimeable number, because it can be changed into a prime (251230543127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4839597 + ... + 4891232.

It is an arithmetic number, because the mean of its divisors is an integer number (16960836690).

Almost surely, 2^251230543122 is an apocalyptic number.

251230543122 is an abundant number, since it is smaller than the sum of its proper divisors (291516230958).

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

251230543122 is a wasteful number, since it uses less digits than its factorization.

251230543122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9731178.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 251230543122 its reverse (221345032152), we get a palindrome (472575575274).

The spelling of 251230543122 in words is "two hundred fifty-one billion, two hundred thirty million, five hundred forty-three thousand, one hundred twenty-two".