91639927 has 2 divisors, whose sum is σ = 91639928. Its totient is φ = 91639926.

The previous prime is 91639883. The next prime is 91639939. The reversal of 91639927 is 72993619.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91639927 - 2⁷ = 91639799 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 (91639967) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45819963 + 45819964.

It is an arithmetic number, because the mean of its divisors is an integer number (45819964).

Almost surely, 2^91639927 is an apocalyptic number.

91639927 is a deficient number, since it is larger than the sum of its proper divisors (1).

91639927 is an equidigital number, since it uses as much as digits as its factorization.

91639927 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 183708, while the sum is 46.

The square root of 91639927 is about 9572.8745421634. The cubic root of 91639927 is about 450.8460248905.

The spelling of 91639927 in words is "ninety-one million, six hundred thirty-nine thousand, nine hundred twenty-seven".