91996187 has 2 divisors, whose sum is σ = 91996188. Its totient is φ = 91996186.

The previous prime is 91996147. The next prime is 91996193. The reversal of 91996187 is 78169919.

It is a strong prime.

It is an emirp because it is prime and its reverse (78169919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91996187 - 2⁶ = 91996123 is a prime.

It is not a weakly prime, because it can be changed into another prime (91996147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45998093 + 45998094.

It is an arithmetic number, because the mean of its divisors is an integer number (45998094).

Almost surely, 2^91996187 is an apocalyptic number.

91996187 is a deficient number, since it is larger than the sum of its proper divisors (1).

91996187 is an equidigital number, since it uses as much as digits as its factorization.

91996187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 50.

The square root of 91996187 is about 9591.4642782007. The cubic root of 91996187 is about 451.4295067783.

The spelling of 91996187 in words is "ninety-one million, nine hundred ninety-six thousand, one hundred eighty-seven".