91670505 has 16 divisors (see below), whose sum is σ = 147830784. Its totient is φ = 48504960.

The previous prime is 91670489. The next prime is 91670519. The reversal of 91670505 is 50507619.

It is not a de Polignac number, because 91670505 - 2⁴ = 91670489 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22156 + ... + 25965.

It is an arithmetic number, because the mean of its divisors is an integer number (9239424).

Almost surely, 2^91670505 is an apocalyptic number.

It is an amenable number.

91670505 is a deficient number, since it is larger than the sum of its proper divisors (56160279).

91670505 is a wasteful number, since it uses less digits than its factorization.

91670505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48256.

The product of its (nonzero) digits is 9450, while the sum is 33.

The square root of 91670505 is about 9574.4715258859. The cubic root of 91670505 is about 450.8961647409.

The spelling of 91670505 in words is "ninety-one million, six hundred seventy thousand, five hundred five".