16939631 has 2 divisors, whose sum is σ = 16939632. Its totient is φ = 16939630.

The previous prime is 16939627. The next prime is 16939669. The reversal of 16939631 is 13693961.

It is an a-pointer prime, because the next prime (16939669) can be obtained adding 16939631 to its sum of digits (38).

It is a weak prime.

It is an emirp because it is prime and its reverse (13693961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16939631 - 2² = 16939627 is a prime.

It is a super-2 number, since 2×16939631² = 573902196832322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16939691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8469815 + 8469816.

It is an arithmetic number, because the mean of its divisors is an integer number (8469816).

Almost surely, 2^16939631 is an apocalyptic number.

16939631 is a deficient number, since it is larger than the sum of its proper divisors (1).

16939631 is an equidigital number, since it uses as much as digits as its factorization.

16939631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 38.

The square root of 16939631 is about 4115.7782982080. The cubic root of 16939631 is about 256.8234339614.

The spelling of 16939631 in words is "sixteen million, nine hundred thirty-nine thousand, six hundred thirty-one".