91901911 has 2 divisors, whose sum is σ = 91901912. Its totient is φ = 91901910.

The previous prime is 91901867. The next prime is 91901921. The reversal of 91901911 is 11910919.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91901911 - 2¹⁵ = 91869143 is a prime.

It is a super-2 number, since 2×91901911² = 16891922490903842, which contains 22 as substring.

It is equal to p_5320849 and since 91901911 and 5320849 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91901921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45950955 + 45950956.

It is an arithmetic number, because the mean of its divisors is an integer number (45950956).

Almost surely, 2^91901911 is an apocalyptic number.

91901911 is a deficient number, since it is larger than the sum of its proper divisors (1).

91901911 is an equidigital number, since it uses as much as digits as its factorization.

91901911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 31.

The square root of 91901911 is about 9586.5484403929. The cubic root of 91901911 is about 451.2752485214.

The spelling of 91901911 in words is "ninety-one million, nine hundred one thousand, nine hundred eleven".