91771493 has 8 divisors (see below), whose sum is σ = 100190496. Its totient is φ = 83365200.

The previous prime is 91771487. The next prime is 91771499. The reversal of 91771493 is 39417719.

It is an interprime number because it is at equal distance from previous prime (91771487) and next prime (91771499).

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

It is a cyclic number.

It is not a de Polignac number, because 91771493 - 2¹⁸ = 91509349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91771493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91771499) 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, 18230 + ... + 22712.

It is an arithmetic number, because the mean of its divisors is an integer number (12523812).

Almost surely, 2^91771493 is an apocalyptic number.

It is an amenable number.

91771493 is a deficient number, since it is larger than the sum of its proper divisors (8419003).

91771493 is a wasteful number, since it uses less digits than its factorization.

91771493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6355.

The product of its digits is 47628, while the sum is 41.

The square root of 91771493 is about 9579.7438901048. The cubic root of 91771493 is about 451.0616792322.

The spelling of 91771493 in words is "ninety-one million, seven hundred seventy-one thousand, four hundred ninety-three".