1618332989 has 16 divisors (see below), whose sum is σ = 2024453760. Its totient is φ = 1259444160.

The previous prime is 1618332979. The next prime is 1618333027. The reversal of 1618332989 is 9892338161.

It is a de Polignac number, because none of the positive numbers 2^k-1618332989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618332979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140219 + ... + 151320.

It is an arithmetic number, because the mean of its divisors is an integer number (126528360).

Almost surely, 2^1618332989 is an apocalyptic number.

It is an amenable number.

1618332989 is a deficient number, since it is larger than the sum of its proper divisors (406120771).

1618332989 is a wasteful number, since it uses less digits than its factorization.

1618332989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291620.

The product of its digits is 559872, while the sum is 50.

The square root of 1618332989 is about 40228.5096542241. The cubic root of 1618332989 is about 1174.0573067207.

The spelling of 1618332989 in words is "one billion, six hundred eighteen million, three hundred thirty-two thousand, nine hundred eighty-nine".