91281793 has 8 divisors (see below), whose sum is σ = 92750528. Its totient is φ = 89824464.

The previous prime is 91281787. The next prime is 91281809. The reversal of 91281793 is 39718219.

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 91281793 - 2⁵ = 91281761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91281713) 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, 14071 + ... + 19507.

It is an arithmetic number, because the mean of its divisors is an integer number (11593816).

Almost surely, 2^91281793 is an apocalyptic number.

It is an amenable number.

91281793 is a deficient number, since it is larger than the sum of its proper divisors (1468735).

91281793 is a wasteful number, since it uses less digits than its factorization.

91281793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5703.

The product of its digits is 27216, while the sum is 40.

The square root of 91281793 is about 9554.1505640219. The cubic root of 91281793 is about 450.2579475851.

The spelling of 91281793 in words is "ninety-one million, two hundred eighty-one thousand, seven hundred ninety-three".