1215122542 has 32 divisors (see below), whose sum is σ = 1970611200. Its totient is φ = 560196000.

The previous prime is 1215122539. The next prime is 1215122543. The reversal of 1215122542 is 2452215121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215122543) 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, 210292 + ... + 215992.

It is an arithmetic number, because the mean of its divisors is an integer number (61581600).

Almost surely, 2^1215122542 is an apocalyptic number.

1215122542 is a deficient number, since it is larger than the sum of its proper divisors (755488658).

1215122542 is a wasteful number, since it uses less digits than its factorization.

1215122542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5872.

The product of its digits is 1600, while the sum is 25.

The square root of 1215122542 is about 34858.6078609000. The cubic root of 1215122542 is about 1067.1038641179.

Adding to 1215122542 its reverse (2452215121), we get a palindrome (3667337663).

The spelling of 1215122542 in words is "one billion, two hundred fifteen million, one hundred twenty-two thousand, five hundred forty-two".