1129856999 has 2 divisors, whose sum is σ = 1129857000. Its totient is φ = 1129856998.

The previous prime is 1129856993. The next prime is 1129857073. The reversal of 1129856999 is 9996589211.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1129856999 - 2⁸ = 1129856743 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 (1129856993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564928499 + 564928500.

It is an arithmetic number, because the mean of its divisors is an integer number (564928500).

Almost surely, 2^1129856999 is an apocalyptic number.

1129856999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1129856999 is an equidigital number, since it uses as much as digits as its factorization.

1129856999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3149280, while the sum is 59.

The square root of 1129856999 is about 33613.3455490524. The cubic root of 1129856999 is about 1041.5364982719.

The spelling of 1129856999 in words is "one billion, one hundred twenty-nine million, eight hundred fifty-six thousand, nine hundred ninety-nine".