12815501 has 8 divisors (see below), whose sum is σ = 13608504. Its totient is φ = 12026880.

The previous prime is 12815489. The next prime is 12815503. The reversal of 12815501 is 10551821.

It can be written as a sum of positive squares in 4 ways, for example, as 42025 + 12773476 = 205^2 + 3574^2 .

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 12815501 - 2⁶ = 12815437 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 (12815503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6491 + ... + 8231.

It is an arithmetic number, because the mean of its divisors is an integer number (1701063).

Almost surely, 2^12815501 is an apocalyptic number.

It is an amenable number.

12815501 is a deficient number, since it is larger than the sum of its proper divisors (793003).

12815501 is a wasteful number, since it uses less digits than its factorization.

12815501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 12815501 is about 3579.8744391389. The cubic root of 12815501 is about 234.0158084628.

The spelling of 12815501 in words is "twelve million, eight hundred fifteen thousand, five hundred one".