8657491 has 4 divisors (see below), whose sum is σ = 8858872. Its totient is φ = 8456112.

The previous prime is 8657461. The next prime is 8657503. The reversal of 8657491 is 1947568.

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

It is a cyclic number.

It is not a de Polignac number, because 8657491 - 2⁹ = 8656979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8657431) 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, 100626 + ... + 100711.

It is an arithmetic number, because the mean of its divisors is an integer number (2214718).

Almost surely, 2^8657491 is an apocalyptic number.

8657491 is a deficient number, since it is larger than the sum of its proper divisors (201381).

8657491 is a wasteful number, since it uses less digits than its factorization.

8657491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201380.

The product of its digits is 60480, while the sum is 40.

The square root of 8657491 is about 2942.3614665775. The cubic root of 8657491 is about 205.3354887355.

The spelling of 8657491 in words is "eight million, six hundred fifty-seven thousand, four hundred ninety-one".