1215113552 has 40 divisors (see below), whose sum is σ = 2468443200. Its totient is φ = 578350080.

The previous prime is 1215113551. The next prime is 1215113569. The reversal of 1215113552 is 2553115121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215113551) 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, 69824 + ... + 85472.

It is an arithmetic number, because the mean of its divisors is an integer number (61711080).

Almost surely, 2^1215113552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215113552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1234221600).

1215113552 is an abundant number, since it is smaller than the sum of its proper divisors (1253329648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215113552 is a wasteful number, since it uses less digits than its factorization.

1215113552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15891 (or 15885 counting only the distinct ones).

The product of its digits is 1500, while the sum is 26.

The square root of 1215113552 is about 34858.4789111631. The cubic root of 1215113552 is about 1067.1012324801.

Adding to 1215113552 its reverse (2553115121), we get a palindrome (3768228673).

The spelling of 1215113552 in words is "one billion, two hundred fifteen million, one hundred thirteen thousand, five hundred fifty-two".