8573991 has 8 divisors (see below), whose sum is σ = 11545584. Its totient is φ = 5659200.

The previous prime is 8573987. The next prime is 8574019. The reversal of 8573991 is 1993758.

It is a happy number.

8573991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 8573991 - 2² = 8573987 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8573951) 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, 13846 + ... + 14451.

It is an arithmetic number, because the mean of its divisors is an integer number (1443198).

Almost surely, 2^8573991 is an apocalyptic number.

8573991 is a deficient number, since it is larger than the sum of its proper divisors (2971593).

8573991 is a wasteful number, since it uses less digits than its factorization.

8573991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28401.

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

The square root of 8573991 is about 2928.1378041342. The cubic root of 8573991 is about 204.6732132405.

The spelling of 8573991 in words is "eight million, five hundred seventy-three thousand, nine hundred ninety-one".