91827917 has 2 divisors, whose sum is σ = 91827918. Its totient is φ = 91827916.

The previous prime is 91827877. The next prime is 91827929. The reversal of 91827917 is 71972819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90992521 + 835396 = 9539^2 + 914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91827917 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 (91827977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45913958 + 45913959.

It is an arithmetic number, because the mean of its divisors is an integer number (45913959).

Almost surely, 2^91827917 is an apocalyptic number.

It is an amenable number.

91827917 is a deficient number, since it is larger than the sum of its proper divisors (1).

91827917 is an equidigital number, since it uses as much as digits as its factorization.

91827917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 44.

The square root of 91827917 is about 9582.6884014873. The cubic root of 91827917 is about 451.1541025951.

The spelling of 91827917 in words is "ninety-one million, eight hundred twenty-seven thousand, nine hundred seventeen".