251522001251 has 4 divisors (see below), whose sum is σ = 251619079104. Its totient is φ = 251424923400.

The previous prime is 251522001223. The next prime is 251522001257. The reversal of 251522001251 is 152100225152.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 251522001251 - 2¹⁴ = 251521984867 is a prime.

It is a super-2 number, since 2×251522001251² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251522001251.

It is not an unprimeable number, because it can be changed into a prime (251522001257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48535040 + ... + 48540221.

It is an arithmetic number, because the mean of its divisors is an integer number (62904769776).

Almost surely, 2^251522001251 is an apocalyptic number.

251522001251 is a deficient number, since it is larger than the sum of its proper divisors (97077853).

251522001251 is an equidigital number, since it uses as much as digits as its factorization.

251522001251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97077852.

The product of its (nonzero) digits is 2000, while the sum is 26.

The spelling of 251522001251 in words is "two hundred fifty-one billion, five hundred twenty-two million, one thousand, two hundred fifty-one".