91650197 has 4 divisors (see below), whose sum is σ = 93379500. Its totient is φ = 89920896.

The previous prime is 91650161. The next prime is 91650199. The reversal of 91650197 is 79105619.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31292836 + 60357361 = 5594^2 + 7769^2 .

It is a cyclic number.

It is not a de Polignac number, because 91650197 - 2¹⁴ = 91633813 is a prime.

It is a super-2 number, since 2×91650197² = 16799517220277618, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91650197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91650199) 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, 864572 + ... + 864677.

It is an arithmetic number, because the mean of its divisors is an integer number (23344875).

Almost surely, 2^91650197 is an apocalyptic number.

It is an amenable number.

91650197 is a deficient number, since it is larger than the sum of its proper divisors (1729303).

91650197 is a wasteful number, since it uses less digits than its factorization.

91650197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1729302.

The product of its (nonzero) digits is 17010, while the sum is 38.

The square root of 91650197 is about 9573.4109386362. The cubic root of 91650197 is about 450.8628662240.

The spelling of 91650197 in words is "ninety-one million, six hundred fifty thousand, one hundred ninety-seven".