16997639 has 2 divisors, whose sum is σ = 16997640. Its totient is φ = 16997638.

The previous prime is 16997633. The next prime is 16997677. The reversal of 16997639 is 93679961.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16997639 - 2⁴ = 16997623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16997633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8498819 + 8498820.

It is an arithmetic number, because the mean of its divisors is an integer number (8498820).

Almost surely, 2^16997639 is an apocalyptic number.

16997639 is a deficient number, since it is larger than the sum of its proper divisors (1).

16997639 is an equidigital number, since it uses as much as digits as its factorization.

16997639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 551124, while the sum is 50.

The square root of 16997639 is about 4122.8193023706. The cubic root of 16997639 is about 257.1162549935.

The spelling of 16997639 in words is "sixteen million, nine hundred ninety-seven thousand, six hundred thirty-nine".