16623449 has 2 divisors, whose sum is σ = 16623450. Its totient is φ = 16623448.

The previous prime is 16623419. The next prime is 16623463. The reversal of 16623449 is 94432661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15015625 + 1607824 = 3875^2 + 1268^2 .

It is an emirp because it is prime and its reverse (94432661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16623449 - 2¹⁶ = 16557913 is a prime.

It is not a weakly prime, because it can be changed into another prime (16623419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8311724 + 8311725.

It is an arithmetic number, because the mean of its divisors is an integer number (8311725).

Almost surely, 2^16623449 is an apocalyptic number.

It is an amenable number.

16623449 is a deficient number, since it is larger than the sum of its proper divisors (1).

16623449 is an equidigital number, since it uses as much as digits as its factorization.

16623449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 35.

The square root of 16623449 is about 4077.1864073157. The cubic root of 16623449 is about 255.2154989801.

The spelling of 16623449 in words is "sixteen million, six hundred twenty-three thousand, four hundred forty-nine".