91617953 has 4 divisors (see below), whose sum is σ = 104706240. Its totient is φ = 78529668.

The previous prime is 91617941. The next prime is 91617991. The reversal of 91617953 is 35971619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35971619 = 83 ⋅433393.

It is not a de Polignac number, because 91617953 - 2⁴ = 91617937 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 91617953.

It is not an unprimeable number, because it can be changed into a prime (91617353) 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, 6544133 + ... + 6544146.

It is an arithmetic number, because the mean of its divisors is an integer number (26176560).

Almost surely, 2^91617953 is an apocalyptic number.

It is an amenable number.

91617953 is a deficient number, since it is larger than the sum of its proper divisors (13088287).

91617953 is a wasteful number, since it uses less digits than its factorization.

91617953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13088286.

The product of its digits is 51030, while the sum is 41.

The square root of 91617953 is about 9571.7267512189. The cubic root of 91617953 is about 450.8099864415.

The spelling of 91617953 in words is "ninety-one million, six hundred seventeen thousand, nine hundred fifty-three".