251117152180189 has 2 divisors, whose sum is σ = 251117152180190. Its totient is φ = 251117152180188.

The previous prime is 251117152180187. The next prime is 251117152180273. The reversal of 251117152180189 is 981081251711152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129249727128025 + 121867425052164 = 11368805^2 + 11039358^2 .

It is a cyclic number.

It is not a de Polignac number, because 251117152180189 - 2¹ = 251117152180187 is a prime.

Together with 251117152180187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251117152180183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125558576090094 + 125558576090095.

It is an arithmetic number, because the mean of its divisors is an integer number (125558576090095).

Almost surely, 2^{251117152180189} is an apocalyptic number.

It is an amenable number.

251117152180189 is a deficient number, since it is larger than the sum of its proper divisors (1).

251117152180189 is an equidigital number, since it uses as much as digits as its factorization.

251117152180189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 52.

The spelling of 251117152180189 in words is "two hundred fifty-one trillion, one hundred seventeen billion, one hundred fifty-two million, one hundred eighty thousand, one hundred eighty-nine".