1616999 has 4 divisors (see below), whose sum is σ = 1656480. Its totient is φ = 1577520.

The previous prime is 1616983. The next prime is 1617019. The reversal of 1616999 is 9996161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1616999 - 2⁴ = 1616983 is a prime.

It is a super-2 number, since 2×1616999² = 5229371532002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 39439 = 1616999 / (1 + 6 + 1 + 6 + 9 + 9 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19679 + ... + 19760.

It is an arithmetic number, because the mean of its divisors is an integer number (414120).

2^1616999 is an apocalyptic number.

1616999 is a deficient number, since it is larger than the sum of its proper divisors (39481).

1616999 is an equidigital number, since it uses as much as digits as its factorization.

1616999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39480.

The product of its digits is 26244, while the sum is 41.

The square root of 1616999 is about 1271.6127555195. The cubic root of 1616999 is about 117.3734626927.

The spelling of 1616999 in words is "one million, six hundred sixteen thousand, nine hundred ninety-nine".