1215536239981 has 16 divisors (see below), whose sum is σ = 1435678010368. Its totient is φ = 1007096716800.

The previous prime is 1215536239943. The next prime is 1215536239987. The reversal of 1215536239981 is 1899326355121.

It is a cyclic number.

It is not a de Polignac number, because 1215536239981 - 2¹⁵ = 1215536207213 is a prime.

It is a super-2 number, since 2×1215536239981² (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 (1215536239987) 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, 3098340 + ... + 3468541.

It is an arithmetic number, because the mean of its divisors is an integer number (89729875648).

Almost surely, 2^{1215536239981} is an apocalyptic number.

It is an amenable number.

1215536239981 is a deficient number, since it is larger than the sum of its proper divisors (220141770387).

1215536239981 is an equidigital number, since it uses as much as digits as its factorization.

1215536239981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6567772.

The product of its digits is 3499200, while the sum is 55.

The spelling of 1215536239981 in words is "one trillion, two hundred fifteen billion, five hundred thirty-six million, two hundred thirty-nine thousand, nine hundred eighty-one".