16681487 has 16 divisors (see below), whose sum is σ = 18376800. Its totient is φ = 15085440.

The previous prime is 16681481. The next prime is 16681493. The reversal of 16681487 is 78418661.

It is an interprime number because it is at equal distance from previous prime (16681481) and next prime (16681493).

It is a cyclic number.

It is not a de Polignac number, because 16681487 - 2¹⁰ = 16680463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16681481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42689 + ... + 43077.

It is an arithmetic number, because the mean of its divisors is an integer number (1148550).

Almost surely, 2^16681487 is an apocalyptic number.

16681487 is a deficient number, since it is larger than the sum of its proper divisors (1695313).

16681487 is a wasteful number, since it uses less digits than its factorization.

16681487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506.

The product of its digits is 64512, while the sum is 41.

The square root of 16681487 is about 4084.2976140335. The cubic root of 16681487 is about 255.5121681086.

The spelling of 16681487 in words is "sixteen million, six hundred eighty-one thousand, four hundred eighty-seven".