1215328427 has 2 divisors, whose sum is σ = 1215328428. Its totient is φ = 1215328426.

The previous prime is 1215328399. The next prime is 1215328493. The reversal of 1215328427 is 7248235121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1215328427 - 2⁸ = 1215328171 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215328627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607664213 + 607664214.

It is an arithmetic number, because the mean of its divisors is an integer number (607664214).

Almost surely, 2^1215328427 is an apocalyptic number.

1215328427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215328427 is an equidigital number, since it uses as much as digits as its factorization.

1215328427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 35.

The square root of 1215328427 is about 34861.5608801442. The cubic root of 1215328427 is about 1067.1641291706.

The spelling of 1215328427 in words is "one billion, two hundred fifteen million, three hundred twenty-eight thousand, four hundred twenty-seven".