1813065989 has 8 divisors (see below), whose sum is σ = 2073072960. Its totient is φ = 1553308416.

The previous prime is 1813065979. The next prime is 1813066009. The reversal of 1813065989 is 9895603181.

It is a happy number.

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 1813065989 - 2⁸ = 1813065733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813065979) 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 7 ways as a sum of consecutive naturals, for example, 46499 + ... + 76080.

It is an arithmetic number, because the mean of its divisors is an integer number (259134120).

Almost surely, 2^1813065989 is an apocalyptic number.

It is an amenable number.

1813065989 is a deficient number, since it is larger than the sum of its proper divisors (260006971).

1813065989 is a wasteful number, since it uses less digits than its factorization.

1813065989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124699.

The product of its (nonzero) digits is 466560, while the sum is 50.

The square root of 1813065989 is about 42580.1125996632. The cubic root of 1813065989 is about 1219.3766386818.

The spelling of 1813065989 in words is "one billion, eight hundred thirteen million, sixty-five thousand, nine hundred eighty-nine".