1215531051513 has 8 divisors (see below), whose sum is σ = 1620813432576. Its totient is φ = 810301352400.

The previous prime is 1215531051509. The next prime is 1215531051521. The reversal of 1215531051513 is 3151501355121.

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

It is not a de Polignac number, because 1215531051513 - 2² = 1215531051509 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215531051523) 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, 13116618 + ... + 13208963.

It is an arithmetic number, because the mean of its divisors is an integer number (202601679072).

Almost surely, 2^{1215531051513} is an apocalyptic number.

It is an amenable number.

1215531051513 is a deficient number, since it is larger than the sum of its proper divisors (405282381063).

1215531051513 is a wasteful number, since it uses less digits than its factorization.

1215531051513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26340975.

The product of its (nonzero) digits is 11250, while the sum is 33.

The spelling of 1215531051513 in words is "one trillion, two hundred fifteen billion, five hundred thirty-one million, fifty-one thousand, five hundred thirteen".