1206881999 has 2 divisors, whose sum is σ = 1206882000. Its totient is φ = 1206881998.

The previous prime is 1206881981. The next prime is 1206882029. The reversal of 1206881999 is 9991886021.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1206881999 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1206881999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1206881959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 603440999 + 603441000.

It is an arithmetic number, because the mean of its divisors is an integer number (603441000).

Almost surely, 2^1206881999 is an apocalyptic number.

1206881999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1206881999 is an equidigital number, since it uses as much as digits as its factorization.

1206881999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 53.

The square root of 1206881999 is about 34740.2072388752. The cubic root of 1206881999 is about 1064.6861467260.

The spelling of 1206881999 in words is "one billion, two hundred six million, eight hundred eighty-one thousand, nine hundred ninety-nine".