8121513 has 8 divisors (see below), whose sum is σ = 10856800. Its totient is φ = 5400288.

The previous prime is 8121499. The next prime is 8121521. The reversal of 8121513 is 3151218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8121513 - 2¹³ = 8113321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8121513.

It is not an unprimeable number, because it can be changed into a prime (8121013) 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, 2083 + ... + 4536.

It is an arithmetic number, because the mean of its divisors is an integer number (1357100).

Almost surely, 2^8121513 is an apocalyptic number.

It is an amenable number.

8121513 is a deficient number, since it is larger than the sum of its proper divisors (2735287).

8121513 is a wasteful number, since it uses less digits than its factorization.

8121513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7031.

The product of its digits is 240, while the sum is 21.

The square root of 8121513 is about 2849.8268368447. The cubic root of 8121513 is about 201.0075242846.

The spelling of 8121513 in words is "eight million, one hundred twenty-one thousand, five hundred thirteen".