91417591 has 4 divisors (see below), whose sum is σ = 91539112. Its totient is φ = 91296072.

The previous prime is 91417567. The next prime is 91417621. The reversal of 91417591 is 19571419.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19571419 = 7 ⋅2795917.

It is a cyclic number.

It is not a de Polignac number, because 91417591 - 2¹¹ = 91415543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91417591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91417511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59625 + ... + 61138.

It is an arithmetic number, because the mean of its divisors is an integer number (22884778).

Almost surely, 2^91417591 is an apocalyptic number.

91417591 is a deficient number, since it is larger than the sum of its proper divisors (121521).

91417591 is a wasteful number, since it uses less digits than its factorization.

91417591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121520.

The product of its digits is 11340, while the sum is 37.

The square root of 91417591 is about 9561.2546770808. The cubic root of 91417591 is about 450.4811167073.

The spelling of 91417591 in words is "ninety-one million, four hundred seventeen thousand, five hundred ninety-one".