91779911 has 2 divisors, whose sum is σ = 91779912. Its totient is φ = 91779910.

The previous prime is 91779847. The next prime is 91779917. The reversal of 91779911 is 11997719.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91779911 - 2⁶ = 91779847 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91779917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45889955 + 45889956.

It is an arithmetic number, because the mean of its divisors is an integer number (45889956).

Almost surely, 2^91779911 is an apocalyptic number.

91779911 is a deficient number, since it is larger than the sum of its proper divisors (1).

91779911 is an equidigital number, since it uses as much as digits as its factorization.

91779911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35721, while the sum is 44.

The square root of 91779911 is about 9580.1832445940. The cubic root of 91779911 is about 451.0754704470.

The spelling of 91779911 in words is "ninety-one million, seven hundred seventy-nine thousand, nine hundred eleven".