126899999 has 2 divisors, whose sum is σ = 126900000. Its totient is φ = 126899998.

The previous prime is 126899989. The next prime is 126900001. The reversal of 126899999 is 999998621.

It is a strong prime.

It is an emirp because it is prime and its reverse (999998621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126899999 is a prime.

It is a super-2 number, since 2×126899999² = 32207219492400002, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 126900001, it forms a pair of twin primes.

It is a Chen prime.

126899999 is a modest number, since divided by 99999 gives 1268 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126899909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63449999 + 63450000.

It is an arithmetic number, because the mean of its divisors is an integer number (63450000).

Almost surely, 2^126899999 is an apocalyptic number.

126899999 is a deficient number, since it is larger than the sum of its proper divisors (1).

126899999 is an equidigital number, since it uses as much as digits as its factorization.

126899999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5668704, while the sum is 62.

The square root of 126899999 is about 11264.9899689258. The cubic root of 126899999 is about 502.5206037607.

The spelling of 126899999 in words is "one hundred twenty-six million, eight hundred ninety-nine thousand, nine hundred ninety-nine".