91799419 has 2 divisors, whose sum is σ = 91799420. Its totient is φ = 91799418.

The previous prime is 91799387. The next prime is 91799467. The reversal of 91799419 is 91499719.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91799419 - 2⁵ = 91799387 is a prime.

It is a super-2 number, since 2×91799419² = 16854266657475122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91799489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45899709 + 45899710.

It is an arithmetic number, because the mean of its divisors is an integer number (45899710).

Almost surely, 2^91799419 is an apocalyptic number.

91799419 is a deficient number, since it is larger than the sum of its proper divisors (1).

91799419 is an equidigital number, since it uses as much as digits as its factorization.

91799419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 183708, while the sum is 49.

The square root of 91799419 is about 9581.2013338621. The cubic root of 91799419 is about 451.1074271748.

The spelling of 91799419 in words is "ninety-one million, seven hundred ninety-nine thousand, four hundred nineteen".