16621631 has 8 divisors (see below), whose sum is σ = 18953424. Its totient is φ = 14440320.

The previous prime is 16621613. The next prime is 16621643. The reversal of 16621631 is 13612661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16621631 - 2⁶ = 16621567 is a prime.

It is a super-2 number, since 2×16621631² = 552557234200322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16621631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16621601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37385 + ... + 37826.

It is an arithmetic number, because the mean of its divisors is an integer number (2369178).

Almost surely, 2^16621631 is an apocalyptic number.

16621631 is a deficient number, since it is larger than the sum of its proper divisors (2331793).

16621631 is a wasteful number, since it uses less digits than its factorization.

16621631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75241.

The product of its digits is 1296, while the sum is 26.

The square root of 16621631 is about 4076.9634533559. The cubic root of 16621631 is about 255.2061948801.

The spelling of 16621631 in words is "sixteen million, six hundred twenty-one thousand, six hundred thirty-one".