91513787071 has 16 divisors (see below), whose sum is σ = 110409096960. Its totient is φ = 74097754560.

The previous prime is 91513787051. The next prime is 91513787077. The reversal of 91513787071 is 17078731519.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91513787071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91513787077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 945310 + ... + 1037611.

It is an arithmetic number, because the mean of its divisors is an integer number (6900568560).

Almost surely, 2^91513787071 is an apocalyptic number.

91513787071 is a deficient number, since it is larger than the sum of its proper divisors (18895309889).

91513787071 is a wasteful number, since it uses less digits than its factorization.

91513787071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983294.

The product of its (nonzero) digits is 370440, while the sum is 49.

The spelling of 91513787071 in words is "ninety-one billion, five hundred thirteen million, seven hundred eighty-seven thousand, seventy-one".