91513489 has 4 divisors (see below), whose sum is σ = 91540800. Its totient is φ = 91486180.

The previous prime is 91513483. The next prime is 91513493. The reversal of 91513489 is 98431519.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91513489 - 2⁹ = 91512977 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91513483) 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, 7789 + ... + 15610.

It is an arithmetic number, because the mean of its divisors is an integer number (22885200).

Almost surely, 2^91513489 is an apocalyptic number.

It is an amenable number.

91513489 is a deficient number, since it is larger than the sum of its proper divisors (27311).

91513489 is a wasteful number, since it uses less digits than its factorization.

91513489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27310.

The product of its digits is 38880, while the sum is 40.

The square root of 91513489 is about 9566.2682901955. The cubic root of 91513489 is about 450.6385814455.

The spelling of 91513489 in words is "ninety-one million, five hundred thirteen thousand, four hundred eighty-nine".