91837489 has 2 divisors, whose sum is σ = 91837490. Its totient is φ = 91837488.

The previous prime is 91837481. The next prime is 91837511. The reversal of 91837489 is 98473819.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91833889 + 3600 = 9583^2 + 60^2 .

It is a cyclic number.

It is not a de Polignac number, because 91837489 - 2³ = 91837481 is a prime.

It is not a weakly prime, because it can be changed into another prime (91837481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45918744 + 45918745.

It is an arithmetic number, because the mean of its divisors is an integer number (45918745).

Almost surely, 2^91837489 is an apocalyptic number.

It is an amenable number.

91837489 is a deficient number, since it is larger than the sum of its proper divisors (1).

91837489 is an equidigital number, since it uses as much as digits as its factorization.

91837489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 49.

The square root of 91837489 is about 9583.1878307795. The cubic root of 91837489 is about 451.1697779190.

The spelling of 91837489 in words is "ninety-one million, eight hundred thirty-seven thousand, four hundred eighty-nine".