91944197 has 2 divisors, whose sum is σ = 91944198. Its totient is φ = 91944196.

The previous prime is 91944161. The next prime is 91944217. The reversal of 91944197 is 79144919.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84070561 + 7873636 = 9169^2 + 2806^2 .

It is a cyclic number.

It is not a de Polignac number, because 91944197 - 2⁸ = 91943941 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91944107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45972098 + 45972099.

It is an arithmetic number, because the mean of its divisors is an integer number (45972099).

Almost surely, 2^91944197 is an apocalyptic number.

It is an amenable number.

91944197 is a deficient number, since it is larger than the sum of its proper divisors (1).

91944197 is an equidigital number, since it uses as much as digits as its factorization.

91944197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 44.

The square root of 91944197 is about 9588.7536729233. The cubic root of 91944197 is about 451.3444516494.

The spelling of 91944197 in words is "ninety-one million, nine hundred forty-four thousand, one hundred ninety-seven".