91239677 has 2 divisors, whose sum is σ = 91239678. Its totient is φ = 91239676.

The previous prime is 91239647. The next prime is 91239749. The reversal of 91239677 is 77693219.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81342361 + 9897316 = 9019^2 + 3146^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91239677 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 (91239607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45619838 + 45619839.

It is an arithmetic number, because the mean of its divisors is an integer number (45619839).

Almost surely, 2^91239677 is an apocalyptic number.

It is an amenable number.

91239677 is a deficient number, since it is larger than the sum of its proper divisors (1).

91239677 is an equidigital number, since it uses as much as digits as its factorization.

91239677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142884, while the sum is 44.

The square root of 91239677 is about 9551.9462414735. The cubic root of 91239677 is about 450.1886895937.

The spelling of 91239677 in words is "ninety-one million, two hundred thirty-nine thousand, six hundred seventy-seven".