251121133559 has 2 divisors, whose sum is σ = 251121133560. Its totient is φ = 251121133558.

The previous prime is 251121133507. The next prime is 251121133561. The reversal of 251121133559 is 955331121152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251121133559 - 2⁸ = 251121133303 is a prime.

Together with 251121133561, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251121133859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125560566779 + 125560566780.

It is an arithmetic number, because the mean of its divisors is an integer number (125560566780).

Almost surely, 2^251121133559 is an apocalyptic number.

251121133559 is a deficient number, since it is larger than the sum of its proper divisors (1).

251121133559 is an equidigital number, since it uses as much as digits as its factorization.

251121133559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40500, while the sum is 38.

The spelling of 251121133559 in words is "two hundred fifty-one billion, one hundred twenty-one million, one hundred thirty-three thousand, five hundred fifty-nine".