1215541013 has 2 divisors, whose sum is σ = 1215541014. Its totient is φ = 1215541012.

The previous prime is 1215540973. The next prime is 1215541037. The reversal of 1215541013 is 3101455121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 738861124 + 476679889 = 27182^2 + 21833^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215541013 - 2¹⁰ = 1215539989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1215541013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215541913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607770506 + 607770507.

It is an arithmetic number, because the mean of its divisors is an integer number (607770507).

Almost surely, 2^1215541013 is an apocalyptic number.

It is an amenable number.

1215541013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215541013 is an equidigital number, since it uses as much as digits as its factorization.

1215541013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1215541013 is about 34864.6097497161. The cubic root of 1215541013 is about 1067.2263485460.

Adding to 1215541013 its reverse (3101455121), we get a palindrome (4316996134).

The spelling of 1215541013 in words is "one billion, two hundred fifteen million, five hundred forty-one thousand, thirteen".