1215381701 has 2 divisors, whose sum is σ = 1215381702. Its totient is φ = 1215381700.

The previous prime is 1215381659. The next prime is 1215381703. The reversal of 1215381701 is 1071835121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1075905601 + 139476100 = 32801^2 + 11810^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215381701 - 2¹⁴ = 1215365317 is a prime.

Together with 1215381703, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215381703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607690850 + 607690851.

It is an arithmetic number, because the mean of its divisors is an integer number (607690851).

Almost surely, 2^1215381701 is an apocalyptic number.

It is an amenable number.

1215381701 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215381701 is an equidigital number, since it uses as much as digits as its factorization.

1215381701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 29.

The square root of 1215381701 is about 34862.3249511561. The cubic root of 1215381701 is about 1067.1797220122.

The spelling of 1215381701 in words is "one billion, two hundred fifteen million, three hundred eighty-one thousand, seven hundred one".