8515122013 has 16 divisors (see below), whose sum is σ = 8879598000. Its totient is φ = 8155607040.

The previous prime is 8515121983. The next prime is 8515122037. The reversal of 8515122013 is 3102215158.

It can be written as a sum of positive squares in 8 ways, for example, as 3141938809 + 5373183204 = 56053^2 + 73302^2 .

It is a cyclic number.

It is not a de Polignac number, because 8515122013 - 2⁹ = 8515121501 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 (8515122043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2354995 + ... + 2358607.

It is an arithmetic number, because the mean of its divisors is an integer number (554974875).

Almost surely, 2^8515122013 is an apocalyptic number.

It is an amenable number.

8515122013 is a deficient number, since it is larger than the sum of its proper divisors (364475987).

8515122013 is a wasteful number, since it uses less digits than its factorization.

8515122013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4272.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 8515122013 is about 92277.4187599545. The cubic root of 8515122013 is about 2042.0370857579.

The spelling of 8515122013 in words is "eight billion, five hundred fifteen million, one hundred twenty-two thousand, thirteen".