90816497 has 4 divisors (see below), whose sum is σ = 90840180. Its totient is φ = 90792816.

The previous prime is 90816457. The next prime is 90816521. The reversal of 90816497 is 79461809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79461809 = 7 ⋅11351687.

It can be written as a sum of positive squares in 2 ways, for example, as 80982001 + 9834496 = 8999^2 + 3136^2 .

It is a cyclic number.

It is not a de Polignac number, because 90816497 - 2²⁴ = 74039281 is a prime.

It is a super-2 number, since 2×90816497² = 16495272254702018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90816457) 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, 4622 + ... + 14247.

It is an arithmetic number, because the mean of its divisors is an integer number (22710045).

Almost surely, 2^90816497 is an apocalyptic number.

It is an amenable number.

90816497 is a deficient number, since it is larger than the sum of its proper divisors (23683).

90816497 is a wasteful number, since it uses less digits than its factorization.

90816497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23682.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 90816497 is about 9529.7689898549. The cubic root of 90816497 is about 449.4916019734.

The spelling of 90816497 in words is "ninety million, eight hundred sixteen thousand, four hundred ninety-seven".