1215710081 has 2 divisors, whose sum is σ = 1215710082. Its totient is φ = 1215710080.

The previous prime is 1215710071. The next prime is 1215710107. The reversal of 1215710081 is 1800175121.

It is an a-pointer prime, because the next prime (1215710107) can be obtained adding 1215710081 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1214871025 + 839056 = 34855^2 + 916^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215710081 - 2¹⁴ = 1215693697 is a prime.

It is a super-2 number, since 2×1215710081² = 2955902002090053122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1215710081.

It is not a weakly prime, because it can be changed into another prime (1215710051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607855040 + 607855041.

It is an arithmetic number, because the mean of its divisors is an integer number (607855041).

Almost surely, 2^1215710081 is an apocalyptic number.

It is an amenable number.

1215710081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215710081 is an equidigital number, since it uses as much as digits as its factorization.

1215710081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 26.

The square root of 1215710081 is about 34867.0343017584. The cubic root of 1215710081 is about 1067.2758259550.

The spelling of 1215710081 in words is "one billion, two hundred fifteen million, seven hundred ten thousand, eighty-one".