1215236849 has 2 divisors, whose sum is σ = 1215236850. Its totient is φ = 1215236848.

The previous prime is 1215236839. The next prime is 1215236861. The reversal of 1215236849 is 9486325121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1020355249 + 194881600 = 31943^2 + 13960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215236849 - 2⁴ = 1215236833 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1215236839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607618424 + 607618425.

It is an arithmetic number, because the mean of its divisors is an integer number (607618425).

Almost surely, 2^1215236849 is an apocalyptic number.

It is an amenable number.

1215236849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215236849 is an equidigital number, since it uses as much as digits as its factorization.

1215236849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 1215236849 is about 34860.2474030234. The cubic root of 1215236849 is about 1067.1373240126.

The spelling of 1215236849 in words is "one billion, two hundred fifteen million, two hundred thirty-six thousand, eight hundred forty-nine".