1215133542 has 128 divisors (see below), whose sum is σ = 3166464000. Its totient is φ = 338256000.

The previous prime is 1215133519. The next prime is 1215133559. The reversal of 1215133542 is 2453315121.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3481584 + ... + 3481932.

It is an arithmetic number, because the mean of its divisors is an integer number (24738000).

Almost surely, 2^1215133542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215133542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1583232000).

1215133542 is an abundant number, since it is smaller than the sum of its proper divisors (1951330458).

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

1215133542 is a wasteful number, since it uses less digits than its factorization.

1215133542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579 (or 573 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1215133542 is about 34858.7656407969. The cubic root of 1215133542 is about 1067.1070841243.

Adding to 1215133542 its reverse (2453315121), we get a palindrome (3668448663).

The spelling of 1215133542 in words is "one billion, two hundred fifteen million, one hundred thirty-three thousand, five hundred forty-two".