1215381611 has 2 divisors, whose sum is σ = 1215381612. Its totient is φ = 1215381610.

The previous prime is 1215381589. The next prime is 1215381623. The reversal of 1215381611 is 1161835121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1215381611 - 2¹⁸ = 1215119467 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215386611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607690805 + 607690806.

It is an arithmetic number, because the mean of its divisors is an integer number (607690806).

Almost surely, 2^1215381611 is an apocalyptic number.

1215381611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215381611 is an equidigital number, since it uses as much as digits as its factorization.

1215381611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 29.

The square root of 1215381611 is about 34862.3236603644. The cubic root of 1215381611 is about 1067.1796956704.

The spelling of 1215381611 in words is "one billion, two hundred fifteen million, three hundred eighty-one thousand, six hundred eleven".