91157591 has 6 divisors (see below), whose sum is σ = 106040520. Its totient is φ = 78135036.

The previous prime is 91157569. The next prime is 91157609. The reversal of 91157591 is 19575119.

It is a de Polignac number, because none of the positive numbers 2^k-91157591 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 (91157531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 930131 + ... + 930228.

It is an arithmetic number, because the mean of its divisors is an integer number (17673420).

Almost surely, 2^91157591 is an apocalyptic number.

91157591 is a deficient number, since it is larger than the sum of its proper divisors (14882929).

91157591 is a wasteful number, since it uses less digits than its factorization.

91157591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860373 (or 1860366 counting only the distinct ones).

The product of its digits is 14175, while the sum is 38.

The square root of 91157591 is about 9547.6484539388. The cubic root of 91157591 is about 450.0536413422.

The spelling of 91157591 in words is "ninety-one million, one hundred fifty-seven thousand, five hundred ninety-one".