16987669 has 2 divisors, whose sum is σ = 16987670. Its totient is φ = 16987668.

The previous prime is 16987661. The next prime is 16987679. The reversal of 16987669 is 96678961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16443025 + 544644 = 4055^2 + 738^2 .

It is a cyclic number.

It is not a de Polignac number, because 16987669 - 2³ = 16987661 is a prime.

It is a super-2 number, since 2×16987669² = 577161796107122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16987661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8493834 + 8493835.

It is an arithmetic number, because the mean of its divisors is an integer number (8493835).

Almost surely, 2^16987669 is an apocalyptic number.

It is an amenable number.

16987669 is a deficient number, since it is larger than the sum of its proper divisors (1).

16987669 is an equidigital number, since it uses as much as digits as its factorization.

16987669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 52.

The square root of 16987669 is about 4121.6100009584. The cubic root of 16987669 is about 257.0659744727.

The spelling of 16987669 in words is "sixteen million, nine hundred eighty-seven thousand, six hundred sixty-nine".