16722491 has 2 divisors, whose sum is σ = 16722492. Its totient is φ = 16722490.

The previous prime is 16722487. The next prime is 16722493. The reversal of 16722491 is 19422761.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16722491 - 2² = 16722487 is a prime.

Together with 16722493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16722493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8361245 + 8361246.

It is an arithmetic number, because the mean of its divisors is an integer number (8361246).

Almost surely, 2^16722491 is an apocalyptic number.

16722491 is a deficient number, since it is larger than the sum of its proper divisors (1).

16722491 is an equidigital number, since it uses as much as digits as its factorization.

16722491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 16722491 is about 4089.3142456896. The cubic root of 16722491 is about 255.7213510646.

The spelling of 16722491 in words is "sixteen million, seven hundred twenty-two thousand, four hundred ninety-one".