8721497 has 4 divisors (see below), whose sum is σ = 8756496. Its totient is φ = 8686500.

The previous prime is 8721487. The next prime is 8721499. The reversal of 8721497 is 7941278.

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 8721497 - 2⁴ = 8721481 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8721497.

It is not an unprimeable number, because it can be changed into a prime (8721499) 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, 17123 + ... + 17624.

It is an arithmetic number, because the mean of its divisors is an integer number (2189124).

Almost surely, 2^8721497 is an apocalyptic number.

It is an amenable number.

8721497 is a deficient number, since it is larger than the sum of its proper divisors (34999).

8721497 is a wasteful number, since it uses less digits than its factorization.

8721497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34998.

The product of its digits is 28224, while the sum is 38.

The square root of 8721497 is about 2953.2180752528. The cubic root of 8721497 is about 205.8402711287.

The spelling of 8721497 in words is "eight million, seven hundred twenty-one thousand, four hundred ninety-seven".