91899387 has 8 divisors (see below), whose sum is σ = 136147280. Its totient is φ = 61266240.

The previous prime is 91899377. The next prime is 91899389. The reversal of 91899387 is 78399819.

It is not a de Polignac number, because 91899387 - 2⁶ = 91899323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91899389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1701814 + ... + 1701867.

It is an arithmetic number, because the mean of its divisors is an integer number (17018410).

Almost surely, 2^91899387 is an apocalyptic number.

91899387 is a deficient number, since it is larger than the sum of its proper divisors (44247893).

91899387 is a wasteful number, since it uses less digits than its factorization.

91899387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3403690 (or 3403684 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 91899387 is about 9586.4167966973. The cubic root of 91899387 is about 451.2711171994.

The spelling of 91899387 in words is "ninety-one million, eight hundred ninety-nine thousand, three hundred eighty-seven".