91573965 has 24 divisors (see below), whose sum is σ = 181404288. Its totient is φ = 41862240.

The previous prime is 91573943. The next prime is 91573987. The reversal of 91573965 is 56937519.

It is an interprime number because it is at equal distance from previous prime (91573943) and next prime (91573987).

It is not a de Polignac number, because 91573965 - 2¹² = 91569869 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 91573965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 145041 + ... + 145670.

It is an arithmetic number, because the mean of its divisors is an integer number (7558512).

Almost surely, 2^91573965 is an apocalyptic number.

It is an amenable number.

91573965 is a deficient number, since it is larger than the sum of its proper divisors (89830323).

91573965 is a wasteful number, since it uses less digits than its factorization.

91573965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290729 (or 290726 counting only the distinct ones).

The product of its digits is 255150, while the sum is 45.

The square root of 91573965 is about 9569.4286663311. The cubic root of 91573965 is about 450.7378266245.

It can be divided in two parts, 91 and 573965, that added together give a triangular number (574056 = T₁₀₇₁).

The spelling of 91573965 in words is "ninety-one million, five hundred seventy-three thousand, nine hundred sixty-five".