1215532919 has 2 divisors, whose sum is σ = 1215532920. Its totient is φ = 1215532918.

The previous prime is 1215532907. The next prime is 1215532921. The reversal of 1215532919 is 9192355121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1215532919 - 2⁸ = 1215532663 is a prime.

It is a super-2 number, since 2×1215532919² = 2955040554345321122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1215532921, 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 (1215532939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607766459 + 607766460.

It is an arithmetic number, because the mean of its divisors is an integer number (607766460).

Almost surely, 2^1215532919 is an apocalyptic number.

1215532919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215532919 is an equidigital number, since it uses as much as digits as its factorization.

1215532919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24300, while the sum is 38.

The square root of 1215532919 is about 34864.4936719293. The cubic root of 1215532919 is about 1067.2239797382.

The spelling of 1215532919 in words is "one billion, two hundred fifteen million, five hundred thirty-two thousand, nine hundred nineteen".