1215003281 has 2 divisors, whose sum is σ = 1215003282. Its totient is φ = 1215003280.

The previous prime is 1215003263. The next prime is 1215003289. The reversal of 1215003281 is 1823005121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1182740881 + 32262400 = 34391^2 + 5680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215003281 is a prime.

It is a super-2 number, since 2×1215003281² = 2952465945681529922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1215003289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607501640 + 607501641.

It is an arithmetic number, because the mean of its divisors is an integer number (607501641).

Almost surely, 2^1215003281 is an apocalyptic number.

It is an amenable number.

1215003281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215003281 is an equidigital number, since it uses as much as digits as its factorization.

1215003281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1215003281 is about 34856.8971797548. The cubic root of 1215003281 is about 1067.0689518537.

The spelling of 1215003281 in words is "one billion, two hundred fifteen million, three thousand, two hundred eighty-one".