1215122543 has 2 divisors, whose sum is σ = 1215122544. Its totient is φ = 1215122542.

The previous prime is 1215122539. The next prime is 1215122563. The reversal of 1215122543 is 3452215121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1215122543 - 2² = 1215122539 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215122563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607561271 + 607561272.

It is an arithmetic number, because the mean of its divisors is an integer number (607561272).

Almost surely, 2^1215122543 is an apocalyptic number.

1215122543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215122543 is an equidigital number, since it uses as much as digits as its factorization.

1215122543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 26.

The square root of 1215122543 is about 34858.6078752437. The cubic root of 1215122543 is about 1067.1038644107.

Adding to 1215122543 its reverse (3452215121), we get a palindrome (4667337664).

The spelling of 1215122543 in words is "one billion, two hundred fifteen million, one hundred twenty-two thousand, five hundred forty-three".