91573089 has 8 divisors (see below), whose sum is σ = 122609280. Its totient is φ = 60792816.

The previous prime is 91573081. The next prime is 91573099. The reversal of 91573089 is 98037519.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91573089 - 2³ = 91573081 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91573089.

It is not an unprimeable number, because it can be changed into a prime (91573081) 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, 63142 + ... + 64575.

It is an arithmetic number, because the mean of its divisors is an integer number (15326160).

Almost surely, 2^91573089 is an apocalyptic number.

It is an amenable number.

91573089 is a deficient number, since it is larger than the sum of its proper divisors (31036191).

91573089 is a wasteful number, since it uses less digits than its factorization.

91573089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127959.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 91573089 is about 9569.3828954641. The cubic root of 91573089 is about 450.7363893615.

It can be divided in two parts, 9157 and 3089, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 91573089 in words is "ninety-one million, five hundred seventy-three thousand, eighty-nine".