91849399 has 2 divisors, whose sum is σ = 91849400. Its totient is φ = 91849398.

The previous prime is 91849379. The next prime is 91849423. The reversal of 91849399 is 99394819.

It is a weak prime.

It is an emirp because it is prime and its reverse (99394819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91849399 - 2⁵ = 91849367 is a prime.

It is a super-2 number, since 2×91849399² = 16872624193322402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91849339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45924699 + 45924700.

It is an arithmetic number, because the mean of its divisors is an integer number (45924700).

Almost surely, 2^91849399 is an apocalyptic number.

91849399 is a deficient number, since it is larger than the sum of its proper divisors (1).

91849399 is an equidigital number, since it uses as much as digits as its factorization.

91849399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 52.

The square root of 91849399 is about 9583.8092113731. The cubic root of 91849399 is about 451.1892804840.

The spelling of 91849399 in words is "ninety-one million, eight hundred forty-nine thousand, three hundred ninety-nine".