91192891 has 2 divisors, whose sum is σ = 91192892. Its totient is φ = 91192890.

The previous prime is 91192873. The next prime is 91192903. The reversal of 91192891 is 19829119.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91192891 - 2⁵ = 91192859 is a prime.

It is a super-2 number, since 2×91192891² = 16632286737875762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91192291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45596445 + 45596446.

It is an arithmetic number, because the mean of its divisors is an integer number (45596446).

Almost surely, 2^91192891 is an apocalyptic number.

91192891 is a deficient number, since it is larger than the sum of its proper divisors (1).

91192891 is an equidigital number, since it uses as much as digits as its factorization.

91192891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 40.

The square root of 91192891 is about 9549.4968977428. The cubic root of 91192891 is about 450.1117269904. Note that the first 3 decimals are identical.

The spelling of 91192891 in words is "ninety-one million, one hundred ninety-two thousand, eight hundred ninety-one".