91447489 has 8 divisors (see below), whose sum is σ = 107883008. Its totient is φ = 75854880.

The previous prime is 91447459. The next prime is 91447501. The reversal of 91447489 is 98474419.

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 91447489 - 2⁵ = 91447457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91447439) 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, 210492 + ... + 210925.

It is an arithmetic number, because the mean of its divisors is an integer number (13485376).

Almost surely, 2^91447489 is an apocalyptic number.

It is an amenable number.

91447489 is a deficient number, since it is larger than the sum of its proper divisors (16435519).

91447489 is a wasteful number, since it uses less digits than its factorization.

91447489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421455.

The product of its digits is 290304, while the sum is 46.

The square root of 91447489 is about 9562.8180469985. The cubic root of 91447489 is about 450.5302211020.

The spelling of 91447489 in words is "ninety-one million, four hundred forty-seven thousand, four hundred eighty-nine".