91149823 has 2 divisors, whose sum is σ = 91149824. Its totient is φ = 91149822.

The previous prime is 91149811. The next prime is 91149829. The reversal of 91149823 is 32894119.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91149823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91149829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45574911 + 45574912.

It is an arithmetic number, because the mean of its divisors is an integer number (45574912).

Almost surely, 2^91149823 is an apocalyptic number.

91149823 is a deficient number, since it is larger than the sum of its proper divisors (1).

91149823 is an equidigital number, since it uses as much as digits as its factorization.

91149823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 91149823 is about 9547.2416435324. The cubic root of 91149823 is about 450.0408571957.

The spelling of 91149823 in words is "ninety-one million, one hundred forty-nine thousand, eight hundred twenty-three".