91321493 has 8 divisors (see below), whose sum is σ = 94970880. Its totient is φ = 87705520.

The previous prime is 91321487. The next prime is 91321499. The reversal of 91321493 is 39412319.

It is an interprime number because it is at equal distance from previous prime (91321487) and next prime (91321499).

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 91321493 - 2¹⁰ = 91320469 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 (91321499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2705 + ... + 13782.

It is an arithmetic number, because the mean of its divisors is an integer number (11871360).

Almost surely, 2^91321493 is an apocalyptic number.

It is an amenable number.

91321493 is a deficient number, since it is larger than the sum of its proper divisors (3649387).

91321493 is a wasteful number, since it uses less digits than its factorization.

91321493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16707.

The product of its digits is 5832, while the sum is 32.

The square root of 91321493 is about 9556.2279692356. The cubic root of 91321493 is about 450.3232130637.

The spelling of 91321493 in words is "ninety-one million, three hundred twenty-one thousand, four hundred ninety-three".