1215816379 has 2 divisors, whose sum is σ = 1215816380. Its totient is φ = 1215816378.

The previous prime is 1215816359. The next prime is 1215816383. The reversal of 1215816379 is 9736185121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1215816379 - 2⁵ = 1215816347 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215816359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607908189 + 607908190.

It is an arithmetic number, because the mean of its divisors is an integer number (607908190).

Almost surely, 2^1215816379 is an apocalyptic number.

1215816379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215816379 is an equidigital number, since it uses as much as digits as its factorization.

1215816379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 1215816379 is about 34868.5586022709. The cubic root of 1215816379 is about 1067.3069315015.

The spelling of 1215816379 in words is "one billion, two hundred fifteen million, eight hundred sixteen thousand, three hundred seventy-nine".