1816314989 has 8 divisors (see below), whose sum is σ = 1828924800. Its totient is φ = 1803740400.

The previous prime is 1816314977. The next prime is 1816315001. The reversal of 1816314989 is 9894136181.

It is an interprime number because it is at equal distance from previous prime (1816314977) and next prime (1816315001).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1816314989 - 2⁸ = 1816314733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816314949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99224 + ... + 116094.

It is an arithmetic number, because the mean of its divisors is an integer number (228615600).

Almost surely, 2^1816314989 is an apocalyptic number.

It is an amenable number.

1816314989 is a deficient number, since it is larger than the sum of its proper divisors (12609811).

1816314989 is a wasteful number, since it uses less digits than its factorization.

1816314989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17611.

The product of its digits is 373248, while the sum is 50.

The square root of 1816314989 is about 42618.2471366432. The cubic root of 1816314989 is about 1220.1045751530.

The spelling of 1816314989 in words is "one billion, eight hundred sixteen million, three hundred fourteen thousand, nine hundred eighty-nine".