91490085 has 24 divisors (see below), whose sum is σ = 162871800. Its totient is φ = 47475072.

The previous prime is 91490071. The next prime is 91490089. The reversal of 91490085 is 58009419.

91490085 is a `hidden beast` number, since 91 + 490 + 0 + 85 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 17564481 + 73925604 = 4191^2 + 8598^2 .

It is not a de Polignac number, because 91490085 - 2⁸ = 91489829 is a prime.

It is a congruent number.

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

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25810 + ... + 29139.

It is an arithmetic number, because the mean of its divisors is an integer number (6786325).

Almost surely, 2^91490085 is an apocalyptic number.

It is an amenable number.

91490085 is a deficient number, since it is larger than the sum of its proper divisors (71381715).

91490085 is a wasteful number, since it uses less digits than its factorization.

91490085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54997 (or 54994 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 91490085 is about 9565.0449554615. The cubic root of 91490085 is about 450.6001621746.

The spelling of 91490085 in words is "ninety-one million, four hundred ninety thousand, eighty-five".