91990411 has 2 divisors, whose sum is σ = 91990412. Its totient is φ = 91990410.

The previous prime is 91990321. The next prime is 91990453. The reversal of 91990411 is 11409919.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91990411 - 2⁹ = 91989899 is a prime.

It is a super-3 number, since 3×91990411³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (91990471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45995205 + 45995206.

It is an arithmetic number, because the mean of its divisors is an integer number (45995206).

Almost surely, 2^91990411 is an apocalyptic number.

91990411 is a deficient number, since it is larger than the sum of its proper divisors (1).

91990411 is an equidigital number, since it uses as much as digits as its factorization.

91990411 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 91990411 is about 9591.1631724207. The cubic root of 91990411 is about 451.4200588816.

The spelling of 91990411 in words is "ninety-one million, nine hundred ninety thousand, four hundred eleven".