251121243351 has 64 divisors (see below), whose sum is σ = 385505464320. Its totient is φ = 143981859840.

The previous prime is 251121243341. The next prime is 251121243383. The reversal of 251121243351 is 153342121152.

It is a happy number.

It is not a de Polignac number, because 251121243351 - 2²² = 251117049047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251121243311) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 43769355 + ... + 43775091.

It is an arithmetic number, because the mean of its divisors is an integer number (6023522880).

Almost surely, 2^251121243351 is an apocalyptic number.

251121243351 is a deficient number, since it is larger than the sum of its proper divisors (134384220969).

251121243351 is a wasteful number, since it uses less digits than its factorization.

251121243351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6696.

The product of its digits is 7200, while the sum is 30.

The spelling of 251121243351 in words is "two hundred fifty-one billion, one hundred twenty-one million, two hundred forty-three thousand, three hundred fifty-one".