16629409 has 2 divisors, whose sum is σ = 16629410. Its totient is φ = 16629408.

The previous prime is 16629401. The next prime is 16629413. The reversal of 16629409 is 90492661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8381025 + 8248384 = 2895^2 + 2872^2 .

It is a cyclic number.

It is not a de Polignac number, because 16629409 - 2³ = 16629401 is a prime.

It is not a weakly prime, because it can be changed into another prime (16629401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8314704 + 8314705.

It is an arithmetic number, because the mean of its divisors is an integer number (8314705).

Almost surely, 2^16629409 is an apocalyptic number.

It is an amenable number.

16629409 is a deficient number, since it is larger than the sum of its proper divisors (1).

16629409 is an equidigital number, since it uses as much as digits as its factorization.

16629409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 16629409 is about 4077.9172380028. The cubic root of 16629409 is about 255.2459961135.

The spelling of 16629409 in words is "sixteen million, six hundred twenty-nine thousand, four hundred nine".