1212409999 has 2 divisors, whose sum is σ = 1212410000. Its totient is φ = 1212409998.

The previous prime is 1212409993. The next prime is 1212410021. The reversal of 1212409999 is 9999042121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212409999 - 2¹³ = 1212401807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212409993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606204999 + 606205000.

It is an arithmetic number, because the mean of its divisors is an integer number (606205000).

Almost surely, 2^1212409999 is an apocalyptic number.

1212409999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212409999 is an equidigital number, since it uses as much as digits as its factorization.

1212409999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 1212409999 is about 34819.6783299329. The cubic root of 1212409999 is about 1066.3092332453.

The spelling of 1212409999 in words is "one billion, two hundred twelve million, four hundred nine thousand, nine hundred ninety-nine".