16722569 has 2 divisors, whose sum is σ = 16722570. Its totient is φ = 16722568.

The previous prime is 16722533. The next prime is 16722581. The reversal of 16722569 is 96522761.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16687225 + 35344 = 4085^2 + 188^2 .

It is a cyclic number.

It is not a de Polignac number, because 16722569 - 2¹² = 16718473 is a prime.

It is a super-2 number, since 2×16722569² = 559288627919522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16722599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8361284 + 8361285.

It is an arithmetic number, because the mean of its divisors is an integer number (8361285).

Almost surely, 2^16722569 is an apocalyptic number.

It is an amenable number.

16722569 is a deficient number, since it is larger than the sum of its proper divisors (1).

16722569 is an equidigital number, since it uses as much as digits as its factorization.

16722569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 16722569 is about 4089.3237827299. The cubic root of 16722569 is about 255.7217486575.

The spelling of 16722569 in words is "sixteen million, seven hundred twenty-two thousand, five hundred sixty-nine".