91013691505 has 8 divisors (see below), whose sum is σ = 119145196224. Its totient is φ = 66191775600.

The previous prime is 91013691497. The next prime is 91013691533. The reversal of 91013691505 is 50519631019.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91013691505 - 2³ = 91013691497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 827397141 + ... + 827397250.

It is an arithmetic number, because the mean of its divisors is an integer number (14893149528).

Almost surely, 2^91013691505 is an apocalyptic number.

It is an amenable number.

91013691505 is a deficient number, since it is larger than the sum of its proper divisors (28131504719).

91013691505 is a wasteful number, since it uses less digits than its factorization.

91013691505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654794407.

The product of its (nonzero) digits is 36450, while the sum is 40.

The spelling of 91013691505 in words is "ninety-one billion, thirteen million, six hundred ninety-one thousand, five hundred five".