22716509 has 4 divisors (see below), whose sum is σ = 22852704. Its totient is φ = 22580316.

The previous prime is 22716497. The next prime is 22716517. The reversal of 22716509 is 90561722.

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 22716509 - 2¹⁶ = 22650973 is a prime.

It is a super-2 number, since 2×22716509² = 1032079562294162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22716559) 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, 67847 + ... + 68180.

It is an arithmetic number, because the mean of its divisors is an integer number (5713176).

Almost surely, 2^22716509 is an apocalyptic number.

It is an amenable number.

22716509 is a deficient number, since it is larger than the sum of its proper divisors (136195).

22716509 is a wasteful number, since it uses less digits than its factorization.

22716509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136194.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 22716509 is about 4766.1839032920. The cubic root of 22716509 is about 283.2134430097.

The spelling of 22716509 in words is "twenty-two million, seven hundred sixteen thousand, five hundred nine".