251226210097 has 2 divisors, whose sum is σ = 251226210098. Its totient is φ = 251226210096.

The previous prime is 251226210073. The next prime is 251226210163. The reversal of 251226210097 is 790012622152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231400443681 + 19825766416 = 481041^2 + 140804^2 .

It is a cyclic number.

It is not a de Polignac number, because 251226210097 - 2³⁵ = 216866471729 is a prime.

It is a super-2 number, since 2×251226210097² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251226210007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125613105048 + 125613105049.

It is an arithmetic number, because the mean of its divisors is an integer number (125613105049).

Almost surely, 2^251226210097 is an apocalyptic number.

It is an amenable number.

251226210097 is a deficient number, since it is larger than the sum of its proper divisors (1).

251226210097 is an equidigital number, since it uses as much as digits as its factorization.

251226210097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 251226210097 in words is "two hundred fifty-one billion, two hundred twenty-six million, two hundred ten thousand, ninety-seven".