90912065 has 4 divisors (see below), whose sum is σ = 109094484. Its totient is φ = 72729648.

The previous prime is 90912043. The next prime is 90912067. The reversal of 90912065 is 56021909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56021909 = 881 ⋅63589.

It can be written as a sum of positive squares in 2 ways, for example, as 35796289 + 55115776 = 5983^2 + 7424^2 .

It is a cyclic number.

It is not a de Polignac number, because 90912065 - 2⁶ = 90912001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90912067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9091202 + ... + 9091211.

It is an arithmetic number, because the mean of its divisors is an integer number (27273621).

Almost surely, 2^90912065 is an apocalyptic number.

It is an amenable number.

90912065 is a deficient number, since it is larger than the sum of its proper divisors (18182419).

90912065 is a wasteful number, since it uses less digits than its factorization.

90912065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18182418.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 90912065 is about 9534.7818538234. The cubic root of 90912065 is about 449.6492163404.

The spelling of 90912065 in words is "ninety million, nine hundred twelve thousand, sixty-five".