91312183 has 2 divisors, whose sum is σ = 91312184. Its totient is φ = 91312182.

The previous prime is 91312153. The next prime is 91312187. The reversal of 91312183 is 38121319.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91312183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91312187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45656091 + 45656092.

It is an arithmetic number, because the mean of its divisors is an integer number (45656092).

Almost surely, 2^91312183 is an apocalyptic number.

91312183 is a deficient number, since it is larger than the sum of its proper divisors (1).

91312183 is an equidigital number, since it uses as much as digits as its factorization.

91312183 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 28.

The square root of 91312183 is about 9555.7408399349. The cubic root of 91312183 is about 450.3079094316.

The spelling of 91312183 in words is "ninety-one million, three hundred twelve thousand, one hundred eighty-three".