91818442 has 4 divisors (see below), whose sum is σ = 137727666. Its totient is φ = 45909220.

The previous prime is 91818427. The next prime is 91818443. The reversal of 91818442 is 24481819.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24481819 = 17 ⋅1440107.

It can be written as a sum of positive squares in only one way, i.e., 65593801 + 26224641 = 8099^2 + 5121^2 .

It is not an unprimeable number, because it can be changed into a prime (91818443) 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, 22954609 + ... + 22954612.

Almost surely, 2^91818442 is an apocalyptic number.

91818442 is a deficient number, since it is larger than the sum of its proper divisors (45909224).

91818442 is a wasteful number, since it uses less digits than its factorization.

91818442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45909223.

The product of its digits is 18432, while the sum is 37.

The square root of 91818442 is about 9582.1940076373. The cubic root of 91818442 is about 451.1385850477.

The spelling of 91818442 in words is "ninety-one million, eight hundred eighteen thousand, four hundred forty-two".