16691087 has 8 divisors (see below), whose sum is σ = 19203072. Its totient is φ = 14211000.

The previous prime is 16691069. The next prime is 16691089. The reversal of 16691087 is 78019661.

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 16691087 - 2⁶ = 16691023 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16691087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16691089) 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, 6839 + ... + 8952.

It is an arithmetic number, because the mean of its divisors is an integer number (2400384).

Almost surely, 2^16691087 is an apocalyptic number.

16691087 is a deficient number, since it is larger than the sum of its proper divisors (2511985).

16691087 is a wasteful number, since it uses less digits than its factorization.

16691087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15949.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 16691087 is about 4085.4726776715. The cubic root of 16691087 is about 255.5611734605.

The spelling of 16691087 in words is "sixteen million, six hundred ninety-one thousand, eighty-seven".