1213787999 has 2 divisors, whose sum is σ = 1213788000. Its totient is φ = 1213787998.

The previous prime is 1213787983. The next prime is 1213788089. The reversal of 1213787999 is 9997873121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1213787999 - 2⁴ = 1213787983 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213787909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606893999 + 606894000.

It is an arithmetic number, because the mean of its divisors is an integer number (606894000).

Almost surely, 2^1213787999 is an apocalyptic number.

1213787999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213787999 is an equidigital number, since it uses as much as digits as its factorization.

1213787999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 56.

The square root of 1213787999 is about 34839.4603718255. The cubic root of 1213787999 is about 1066.7130619251.

The spelling of 1213787999 in words is "one billion, two hundred thirteen million, seven hundred eighty-seven thousand, nine hundred ninety-nine".