16587861 has 4 divisors (see below), whose sum is σ = 22117152. Its totient is φ = 11058572.

The previous prime is 16587859. The next prime is 16587881. The reversal of 16587861 is 16878561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16587861 - 2¹ = 16587859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16587811) 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, 2764641 + ... + 2764646.

It is an arithmetic number, because the mean of its divisors is an integer number (5529288).

Almost surely, 2^16587861 is an apocalyptic number.

It is an amenable number.

16587861 is a deficient number, since it is larger than the sum of its proper divisors (5529291).

16587861 is an equidigital number, since it uses as much as digits as its factorization.

16587861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5529290.

The product of its digits is 80640, while the sum is 42.

The square root of 16587861 is about 4072.8197848665. The cubic root of 16587861 is about 255.0332444162.

The spelling of 16587861 in words is "sixteen million, five hundred eighty-seven thousand, eight hundred sixty-one".