1191117254087 has 2 divisors, whose sum is σ = 1191117254088. Its totient is φ = 1191117254086.

The previous prime is 1191117254057. The next prime is 1191117254189. The reversal of 1191117254087 is 7804527111911.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1191117254087 - 2⁸ = 1191117253831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191117254057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595558627043 + 595558627044.

It is an arithmetic number, because the mean of its divisors is an integer number (595558627044).

Almost surely, 2^{1191117254087} is an apocalyptic number.

1191117254087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191117254087 is an equidigital number, since it uses as much as digits as its factorization.

1191117254087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 47.

The spelling of 1191117254087 in words is "one trillion, one hundred ninety-one billion, one hundred seventeen million, two hundred fifty-four thousand, eighty-seven".