1215552919481 has 4 divisors (see below), whose sum is σ = 1220638915200. Its totient is φ = 1210466923764.

The previous prime is 1215552919447. The next prime is 1215552919489. The reversal of 1215552919481 is 1849192555121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1215552919481 - 2³⁴ = 1198373050297 is a prime.

It is a super-2 number, since 2×1215552919481² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215552919489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2542997501 + ... + 2542997978.

It is an arithmetic number, because the mean of its divisors is an integer number (305159728800).

Almost surely, 2^{1215552919481} is an apocalyptic number.

It is an amenable number.

1215552919481 is a deficient number, since it is larger than the sum of its proper divisors (5085995719).

1215552919481 is an equidigital number, since it uses as much as digits as its factorization.

1215552919481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5085995718.

The product of its digits is 1296000, while the sum is 53.

The spelling of 1215552919481 in words is "one trillion, two hundred fifteen billion, five hundred fifty-two million, nine hundred nineteen thousand, four hundred eighty-one".