91794509 has 4 divisors (see below), whose sum is σ = 97194204. Its totient is φ = 86394816.

The previous prime is 91794499. The next prime is 91794539. The reversal of 91794509 is 90549719.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33988900 + 57805609 = 5830^2 + 7603^2 .

It is a de Polignac number, because none of the positive numbers 2^k-91794509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91794509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91794539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2699822 + ... + 2699855.

It is an arithmetic number, because the mean of its divisors is an integer number (24298551).

Almost surely, 2^91794509 is an apocalyptic number.

It is an amenable number.

91794509 is a deficient number, since it is larger than the sum of its proper divisors (5399695).

91794509 is a wasteful number, since it uses less digits than its factorization.

91794509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5399694.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 91794509 is about 9580.9450995191. The cubic root of 91794509 is about 451.0993843608.

The spelling of 91794509 in words is "ninety-one million, seven hundred ninety-four thousand, five hundred nine".