16971631 has 4 divisors (see below), whose sum is σ = 17709552. Its totient is φ = 16233712.

The previous prime is 16971623. The next prime is 16971637. The reversal of 16971631 is 13617961.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16971631 - 2³ = 16971623 is a prime.

It is a super-2 number, since 2×16971631² = 576072517600322, 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 (16971637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368926 + ... + 368971.

It is an arithmetic number, because the mean of its divisors is an integer number (4427388).

Almost surely, 2^16971631 is an apocalyptic number.

16971631 is a deficient number, since it is larger than the sum of its proper divisors (737921).

16971631 is an equidigital number, since it uses as much as digits as its factorization.

16971631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737920.

The product of its digits is 6804, while the sum is 34.

The square root of 16971631 is about 4119.6639426050. The cubic root of 16971631 is about 256.9850506326.

The spelling of 16971631 in words is "sixteen million, nine hundred seventy-one thousand, six hundred thirty-one".