1215383015581 has 8 divisors (see below), whose sum is σ = 1389020480064. Its totient is φ = 1041748380960.

The previous prime is 1215383015579. The next prime is 1215383015621. The reversal of 1215383015581 is 1855103835121.

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

It is not a de Polignac number, because 1215383015581 - 2¹ = 1215383015579 is a prime.

It is a super-2 number, since 2×1215383015581² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215383015521) 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, 310521 + ... + 1589713.

It is an arithmetic number, because the mean of its divisors is an integer number (173627560008).

Almost surely, 2^{1215383015581} is an apocalyptic number.

It is an amenable number.

1215383015581 is a deficient number, since it is larger than the sum of its proper divisors (173637464483).

1215383015581 is a wasteful number, since it uses less digits than its factorization.

1215383015581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414931.

The product of its (nonzero) digits is 144000, while the sum is 43.

The spelling of 1215383015581 in words is "one trillion, two hundred fifteen billion, three hundred eighty-three million, fifteen thousand, five hundred eighty-one".