1616133989 has 4 divisors (see below), whose sum is σ = 1659813324. Its totient is φ = 1572454656.

The previous prime is 1616133971. The next prime is 1616133997. The reversal of 1616133989 is 9893316161.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1538992900 + 77141089 = 39230^2 + 8783^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616133989 - 2²⁸ = 1347698533 is a prime.

It is a super-2 number, since 2×1616133989² = 5223778140802104242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616133949) 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, 21839612 + ... + 21839685.

It is an arithmetic number, because the mean of its divisors is an integer number (414953331).

Almost surely, 2^1616133989 is an apocalyptic number.

It is an amenable number.

1616133989 is a deficient number, since it is larger than the sum of its proper divisors (43679335).

1616133989 is an equidigital number, since it uses as much as digits as its factorization.

1616133989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43679334.

The product of its digits is 209952, while the sum is 47.

The square root of 1616133989 is about 40201.1690004159. The cubic root of 1616133989 is about 1173.5252937821.

The spelling of 1616133989 in words is "one billion, six hundred sixteen million, one hundred thirty-three thousand, nine hundred eighty-nine".