91490871 has 8 divisors (see below), whose sum is σ = 128408320. Its totient is φ = 57783672.

The previous prime is 91490869. The next prime is 91490881. The reversal of 91490871 is 17809419.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91490871 - 2¹ = 91490869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91490881) 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 7 ways as a sum of consecutive naturals, for example, 802495 + ... + 802608.

It is an arithmetic number, because the mean of its divisors is an integer number (16051040).

Almost surely, 2^91490871 is an apocalyptic number.

91490871 is a deficient number, since it is larger than the sum of its proper divisors (36917449).

91490871 is a wasteful number, since it uses less digits than its factorization.

91490871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1605125.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 91490871 is about 9565.0860424776. The cubic root of 91490871 is about 450.6014525538.

The spelling of 91490871 in words is "ninety-one million, four hundred ninety thousand, eight hundred seventy-one".