815189989 has 8 divisors (see below), whose sum is σ = 850993920. Its totient is φ = 779416176.

The previous prime is 815189987. The next prime is 815189993. The reversal of 815189989 is 989981518.

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 815189989 - 2¹ = 815189987 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 (815189987) 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 7 ways as a sum of consecutive naturals, for example, 61267 + ... + 73375.

It is an arithmetic number, because the mean of its divisors is an integer number (106374240).

Almost surely, 2^815189989 is an apocalyptic number.

It is an amenable number.

815189989 is a deficient number, since it is larger than the sum of its proper divisors (35803931).

815189989 is a wasteful number, since it uses less digits than its factorization.

815189989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15059.

The product of its digits is 1866240, while the sum is 58.

The square root of 815189989 is about 28551.5321655424. The cubic root of 815189989 is about 934.1564408799.

The spelling of 815189989 in words is "eight hundred fifteen million, one hundred eighty-nine thousand, nine hundred eighty-nine".