8978515849 has 2 divisors, whose sum is σ = 8978515850. Its totient is φ = 8978515848.

The previous prime is 8978515837. The next prime is 8978515877. The reversal of 8978515849 is 9485158798.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8207454025 + 771061824 = 90595^2 + 27768^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8978515849 is a prime.

It is a super-2 number, since 2×8978515849² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8978515829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4489257924 + 4489257925.

It is an arithmetic number, because the mean of its divisors is an integer number (4489257925).

Almost surely, 2^8978515849 is an apocalyptic number.

It is an amenable number.

8978515849 is a deficient number, since it is larger than the sum of its proper divisors (1).

8978515849 is an equidigital number, since it uses as much as digits as its factorization.

8978515849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29030400, while the sum is 64.

The square root of 8978515849 is about 94755.0307318825. The cubic root of 8978515849 is about 2078.4273622555.

The spelling of 8978515849 in words is "eight billion, nine hundred seventy-eight million, five hundred fifteen thousand, eight hundred forty-nine".