819989013 has 8 divisors (see below), whose sum is σ = 1095788448. Its totient is φ = 545424464.

The previous prime is 819988997. The next prime is 819989047. The reversal of 819989013 is 310989918.

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 819989013 - 2⁴ = 819988997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819982013) 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, 307170 + ... + 309827.

It is an arithmetic number, because the mean of its divisors is an integer number (136973556).

Almost surely, 2^819989013 is an apocalyptic number.

It is an amenable number.

819989013 is a deficient number, since it is larger than the sum of its proper divisors (275799435).

819989013 is a wasteful number, since it uses less digits than its factorization.

819989013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617443.

The product of its (nonzero) digits is 139968, while the sum is 48.

The square root of 819989013 is about 28635.4502845686. The cubic root of 819989013 is about 935.9859819199.

The spelling of 819989013 in words is "eight hundred nineteen million, nine hundred eighty-nine thousand, thirteen".