91478565 has 28 divisors (see below), whose sum is σ = 164592684. Its totient is φ = 48786624.

The previous prime is 91478549. The next prime is 91478573. The reversal of 91478565 is 56587419.

91478565 is a `hidden beast` number, since 9 + 14 + 78 + 565 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 29746116 + 61732449 = 5454^2 + 7857^2 .

It is not a de Polignac number, because 91478565 - 2⁴ = 91478549 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 91478565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 8904 + ... + 16193.

Almost surely, 2^91478565 is an apocalyptic number.

It is an amenable number.

91478565 is a deficient number, since it is larger than the sum of its proper divisors (73114119).

91478565 is an equidigital number, since it uses as much as digits as its factorization.

91478565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25120 (or 25105 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 91478565 is about 9564.4427438299. The cubic root of 91478565 is about 450.5812488983.

The spelling of 91478565 in words is "ninety-one million, four hundred seventy-eight thousand, five hundred sixty-five".