90500197 has 4 divisors (see below), whose sum is σ = 95823756. Its totient is φ = 85176640.

The previous prime is 90500131. The next prime is 90500227. The reversal of 90500197 is 79100509.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79100509 = 2579 ⋅30671.

It can be written as a sum of positive squares in 2 ways, for example, as 67469796 + 23030401 = 8214^2 + 4799^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90500197 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90500297) 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, 2661754 + ... + 2661787.

It is an arithmetic number, because the mean of its divisors is an integer number (23955939).

Almost surely, 2^90500197 is an apocalyptic number.

It is an amenable number.

90500197 is a deficient number, since it is larger than the sum of its proper divisors (5323559).

90500197 is a wasteful number, since it uses less digits than its factorization.

90500197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5323558.

The product of its (nonzero) digits is 2835, while the sum is 31.

The square root of 90500197 is about 9513.1591493047. The cubic root of 90500197 is about 448.9691580874.

The spelling of 90500197 in words is "ninety million, five hundred thousand, one hundred ninety-seven".