251522250961 has 2 divisors, whose sum is σ = 251522250962. Its totient is φ = 251522250960.

The previous prime is 251522250871. The next prime is 251522251037. The reversal of 251522250961 is 169052225152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 251145308736 + 376942225 = 501144^2 + 19415^2 .

It is a cyclic number.

It is not a de Polignac number, because 251522250961 - 2²¹ = 251520153809 is a prime.

It is not a weakly prime, because it can be changed into another prime (251522250061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125761125480 + 125761125481.

It is an arithmetic number, because the mean of its divisors is an integer number (125761125481).

Almost surely, 2^251522250961 is an apocalyptic number.

It is an amenable number.

251522250961 is a deficient number, since it is larger than the sum of its proper divisors (1).

251522250961 is an equidigital number, since it uses as much as digits as its factorization.

251522250961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 251522250961 in words is "two hundred fifty-one billion, five hundred twenty-two million, two hundred fifty thousand, nine hundred sixty-one".