91285567 has 4 divisors (see below), whose sum is σ = 92832840. Its totient is φ = 89738296.

The previous prime is 91285541. The next prime is 91285573. The reversal of 91285567 is 76558219.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76558219 = 1601 ⋅47819.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91285567 is a prime.

It is a super-2 number, since 2×91285567² = 16666109485022978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91285507) 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, 773548 + ... + 773665.

It is an arithmetic number, because the mean of its divisors is an integer number (23208210).

Almost surely, 2^91285567 is an apocalyptic number.

91285567 is a deficient number, since it is larger than the sum of its proper divisors (1547273).

91285567 is a wasteful number, since it uses less digits than its factorization.

91285567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547272.

The product of its digits is 151200, while the sum is 43.

The square root of 91285567 is about 9554.3480677647. The cubic root of 91285567 is about 450.2641527293.

The spelling of 91285567 in words is "ninety-one million, two hundred eighty-five thousand, five hundred sixty-seven".