91490081 has 4 divisors (see below), whose sum is σ = 91544964. Its totient is φ = 91435200.

The previous prime is 91490071. The next prime is 91490089. The reversal of 91490081 is 18009419.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64657681 + 26832400 = 8041^2 + 5180^2 .

It is a cyclic number.

It is not a de Polignac number, because 91490081 - 2⁶ = 91490017 is a prime.

It is a super-2 number, since 2×91490081² = 16740869842773122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91490089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24860 + ... + 28301.

It is an arithmetic number, because the mean of its divisors is an integer number (22886241).

Almost surely, 2^91490081 is an apocalyptic number.

It is an amenable number.

91490081 is a deficient number, since it is larger than the sum of its proper divisors (54883).

91490081 is a wasteful number, since it uses less digits than its factorization.

91490081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54882.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 91490081 is about 9565.0447463668. The cubic root of 91490081 is about 450.6001556078.

The spelling of 91490081 in words is "ninety-one million, four hundred ninety thousand, eighty-one".