251201015122 has 4 divisors (see below), whose sum is σ = 376801522686. Its totient is φ = 125600507560.

The previous prime is 251201015119. The next prime is 251201015147. The reversal of 251201015122 is 221510102152.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 203012423761 + 48188591361 = 450569^2 + 219519^2 .

It is a junction number, because it is equal to n+sod(n) for n = 251201015093 and 251201015102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62800253779 + ... + 62800253782.

Almost surely, 2^251201015122 is an apocalyptic number.

251201015122 is a deficient number, since it is larger than the sum of its proper divisors (125600507564).

251201015122 is a wasteful number, since it uses less digits than its factorization.

251201015122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125600507563.

The product of its (nonzero) digits is 400, while the sum is 22.

Adding to 251201015122 its reverse (221510102152), we get a palindrome (472711117274).

The spelling of 251201015122 in words is "two hundred fifty-one billion, two hundred one million, fifteen thousand, one hundred twenty-two".