91562992091 has 4 divisors (see below), whose sum is σ = 91582383432. Its totient is φ = 91543600752.

The previous prime is 91562992061. The next prime is 91562992121. The reversal of 91562992091 is 19029926519.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (91562992061) and next prime (91562992121).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91562992091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91562992051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9688586 + ... + 9698031.

It is an arithmetic number, because the mean of its divisors is an integer number (22895595858).

Almost surely, 2^91562992091 is an apocalyptic number.

91562992091 is a deficient number, since it is larger than the sum of its proper divisors (19391341).

91562992091 is a wasteful number, since it uses less digits than its factorization.

91562992091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19391340.

The product of its (nonzero) digits is 787320, while the sum is 53.

The spelling of 91562992091 in words is "ninety-one billion, five hundred sixty-two million, nine hundred ninety-two thousand, ninety-one".