91989242 has 16 divisors (see below), whose sum is σ = 139682400. Its totient is φ = 45431280.

The previous prime is 91989223. The next prime is 91989251. The reversal of 91989242 is 24298919.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 91989193 and 91989202.

It is an unprimeable number.

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, 124109 + ... + 124847.

It is an arithmetic number, because the mean of its divisors is an integer number (8730150).

Almost surely, 2^91989242 is an apocalyptic number.

91989242 is a deficient number, since it is larger than the sum of its proper divisors (47693158).

91989242 is a wasteful number, since it uses less digits than its factorization.

91989242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421.

The product of its digits is 93312, while the sum is 44.

The square root of 91989242 is about 9591.1022307136. The cubic root of 91989242 is about 451.4181466813.

The spelling of 91989242 in words is "ninety-one million, nine hundred eighty-nine thousand, two hundred forty-two".