1215540259 has 2 divisors, whose sum is σ = 1215540260. Its totient is φ = 1215540258.

The previous prime is 1215540203. The next prime is 1215540299. The reversal of 1215540259 is 9520455121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1215540259 - 2¹¹ = 1215538211 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215540299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607770129 + 607770130.

It is an arithmetic number, because the mean of its divisors is an integer number (607770130).

Almost surely, 2^1215540259 is an apocalyptic number.

1215540259 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215540259 is an equidigital number, since it uses as much as digits as its factorization.

1215540259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 1215540259 is about 34864.5989364570. The cubic root of 1215540259 is about 1067.2261278792.

The spelling of 1215540259 in words is "one billion, two hundred fifteen million, five hundred forty thousand, two hundred fifty-nine".