16831987 has 4 divisors (see below), whose sum is σ = 16843480. Its totient is φ = 16820496.

The previous prime is 16831979. The next prime is 16832027. The reversal of 16831987 is 78913861.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 78913861 = 13 ⋅6070297.

It is a cyclic number.

It is not a de Polignac number, because 16831987 - 2³ = 16831979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16831937) 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, 3162 + ... + 6607.

It is an arithmetic number, because the mean of its divisors is an integer number (4210870).

Almost surely, 2^16831987 is an apocalyptic number.

16831987 is a deficient number, since it is larger than the sum of its proper divisors (11493).

16831987 is an equidigital number, since it uses as much as digits as its factorization.

16831987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11492.

The product of its digits is 72576, while the sum is 43.

The square root of 16831987 is about 4102.6804652568. The cubic root of 16831987 is about 256.2782771095.

The spelling of 16831987 in words is "sixteen million, eight hundred thirty-one thousand, nine hundred eighty-seven".