89191081 has 4 divisors (see below), whose sum is σ = 101932672. Its totient is φ = 76449492.

The previous prime is 89191057. The next prime is 89191097. The reversal of 89191081 is 18019198.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 89191081 - 2⁵ = 89191049 is a prime.

It is a super-2 number, since 2×89191081² = 15910097859897122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 89191081.

It is not an unprimeable number, because it can be changed into a prime (89191021) 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 in 3 ways as a sum of consecutive naturals, for example, 6370785 + ... + 6370798.

It is an arithmetic number, because the mean of its divisors is an integer number (25483168).

Almost surely, 2^89191081 is an apocalyptic number.

It is an amenable number.

89191081 is a deficient number, since it is larger than the sum of its proper divisors (12741591).

89191081 is a wasteful number, since it uses less digits than its factorization.

89191081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12741590.

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 89191081 is about 9444.1029748727. The cubic root of 89191081 is about 446.7938047405.

It can be divided in two parts, 8919 and 1081, that added together give a 4-th power (10000 = 10⁴).

The spelling of 89191081 in words is "eighty-nine million, one hundred ninety-one thousand, eighty-one".