91955565 has 24 divisors (see below), whose sum is σ = 171651480. Its totient is φ = 45270144.

The previous prime is 91955531. The next prime is 91955593. The reversal of 91955565 is 56555919.

91955565 is a `hidden beast` number, since 9 + 1 + 95 + 556 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1572516 + 90383049 = 1254^2 + 9507^2 .

It is not a de Polignac number, because 91955565 - 2¹⁴ = 91939181 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 91955565.

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, 78010 + ... + 79179.

It is an arithmetic number, because the mean of its divisors is an integer number (7152145).

Almost surely, 2^91955565 is an apocalyptic number.

It is an amenable number.

91955565 is a deficient number, since it is larger than the sum of its proper divisors (79695915).

91955565 is a wasteful number, since it uses less digits than its factorization.

91955565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157213 (or 157210 counting only the distinct ones).

The product of its digits is 303750, while the sum is 45.

The square root of 91955565 is about 9589.3464323696. The cubic root of 91955565 is about 451.3630523240.

The spelling of 91955565 in words is "ninety-one million, nine hundred fifty-five thousand, five hundred sixty-five".