251122521197 has 2 divisors, whose sum is σ = 251122521198. Its totient is φ = 251122521196.

The previous prime is 251122521193. The next prime is 251122521211. The reversal of 251122521197 is 791125221152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208178662756 + 42943858441 = 456266^2 + 207229^2 .

It is a cyclic number.

It is not a de Polignac number, because 251122521197 - 2² = 251122521193 is a prime.

It is a super-3 number, since 3×251122521197³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 251122521197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251122521193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125561260598 + 125561260599.

It is an arithmetic number, because the mean of its divisors is an integer number (125561260599).

Almost surely, 2^251122521197 is an apocalyptic number.

It is an amenable number.

251122521197 is a deficient number, since it is larger than the sum of its proper divisors (1).

251122521197 is an equidigital number, since it uses as much as digits as its factorization.

251122521197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 38.

The spelling of 251122521197 in words is "two hundred fifty-one billion, one hundred twenty-two million, five hundred twenty-one thousand, one hundred ninety-seven".