251121515241 has 16 divisors (see below), whose sum is σ = 341532749376. Its totient is φ = 164069470656.

The previous prime is 251121515219. The next prime is 251121515299. The reversal of 251121515241 is 142515121152.

It is not a de Polignac number, because 251121515241 - 2¹⁴ = 251121498857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251121515199 and 251121515208.

It is not an unprimeable number, because it can be changed into a prime (251121515341) 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, 753930 + ... + 1034723.

It is an arithmetic number, because the mean of its divisors is an integer number (21345796836).

Almost surely, 2^251121515241 is an apocalyptic number.

It is an amenable number.

251121515241 is a deficient number, since it is larger than the sum of its proper divisors (90411234135).

251121515241 is a wasteful number, since it uses less digits than its factorization.

251121515241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789592.

The product of its digits is 4000, while the sum is 30.

Adding to 251121515241 its reverse (142515121152), we get a palindrome (393636636393).

The spelling of 251121515241 in words is "two hundred fifty-one billion, one hundred twenty-one million, five hundred fifteen thousand, two hundred forty-one".