91187519094613 has 2 divisors, whose sum is σ = 91187519094614. Its totient is φ = 91187519094612.

The previous prime is 91187519094571. The next prime is 91187519094619. The reversal of 91187519094613 is 31649091578119.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51592931883684 + 39594587210929 = 7182822^2 + 6292423^2 .

It is a cyclic number.

It is not a de Polignac number, because 91187519094613 - 2⁹ = 91187519094101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91187519094619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45593759547306 + 45593759547307.

It is an arithmetic number, because the mean of its divisors is an integer number (45593759547307).

Almost surely, 2^{91187519094613} is an apocalyptic number.

It is an amenable number.

91187519094613 is a deficient number, since it is larger than the sum of its proper divisors (1).

91187519094613 is an equidigital number, since it uses as much as digits as its factorization.

91187519094613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14696640, while the sum is 64.

The spelling of 91187519094613 in words is "ninety-one trillion, one hundred eighty-seven billion, five hundred nineteen million, ninety-four thousand, six hundred thirteen".