8515472989 has 4 divisors (see below), whose sum is σ = 8515755324. Its totient is φ = 8515190656.

The previous prime is 8515472921. The next prime is 8515473017. The reversal of 8515472989 is 9892745158.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2594170489 + 5921302500 = 50933^2 + 76950^2 .

It is a cyclic number.

It is not a de Polignac number, because 8515472989 - 2¹⁷ = 8515341917 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8515472909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89662 + ... + 158335.

It is an arithmetic number, because the mean of its divisors is an integer number (2128938831).

Almost surely, 2^8515472989 is an apocalyptic number.

It is an amenable number.

8515472989 is a deficient number, since it is larger than the sum of its proper divisors (282335).

8515472989 is a wasteful number, since it uses less digits than its factorization.

8515472989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282334.

The product of its digits is 7257600, while the sum is 58.

The square root of 8515472989 is about 92279.3204840608. The cubic root of 8515472989 is about 2042.0651415767.

The spelling of 8515472989 in words is "eight billion, five hundred fifteen million, four hundred seventy-two thousand, nine hundred eighty-nine".