16609631 has 4 divisors (see below), whose sum is σ = 16632000. Its totient is φ = 16587264.

The previous prime is 16609613. The next prime is 16609643. The reversal of 16609631 is 13690661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13690661 = 17 ⋅805333.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16609631 is a prime.

It is a super-2 number, since 2×16609631² = 551759683912322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16609331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10031 + ... + 11568.

It is an arithmetic number, because the mean of its divisors is an integer number (4158000).

Almost surely, 2^16609631 is an apocalyptic number.

16609631 is a deficient number, since it is larger than the sum of its proper divisors (22369).

16609631 is an equidigital number, since it uses as much as digits as its factorization.

16609631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22368.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 16609631 is about 4075.4915041011. The cubic root of 16609631 is about 255.1447646547.

The spelling of 16609631 in words is "sixteen million, six hundred nine thousand, six hundred thirty-one".