1251331241191 has 2 divisors, whose sum is σ = 1251331241192. Its totient is φ = 1251331241190.

The previous prime is 1251331241189. The next prime is 1251331241201. The reversal of 1251331241191 is 1911421331521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1251331241191 - 2¹ = 1251331241189 is a prime.

Together with 1251331241189, 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 (1251331241141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625665620595 + 625665620596.

It is an arithmetic number, because the mean of its divisors is an integer number (625665620596).

Almost surely, 2^{1251331241191} is an apocalyptic number.

1251331241191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251331241191 is an equidigital number, since it uses as much as digits as its factorization.

1251331241191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 34.

The spelling of 1251331241191 in words is "one trillion, two hundred fifty-one billion, three hundred thirty-one million, two hundred forty-one thousand, one hundred ninety-one".