126899989 has 2 divisors, whose sum is σ = 126899990. Its totient is φ = 126899988.

The previous prime is 126899987. The next prime is 126899999. The reversal of 126899989 is 989998621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87272964 + 39627025 = 9342^2 + 6295^2 .

It is a cyclic number.

It is not a de Polignac number, because 126899989 - 2¹ = 126899987 is a prime.

It is a super-2 number, since 2×126899989² = 32207214416400242, which contains 22 as substring.

Together with 126899987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126899987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63449994 + 63449995.

It is an arithmetic number, because the mean of its divisors is an integer number (63449995).

Almost surely, 2^126899989 is an apocalyptic number.

It is an amenable number.

126899989 is a deficient number, since it is larger than the sum of its proper divisors (1).

126899989 is an equidigital number, since it uses as much as digits as its factorization.

126899989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5038848, while the sum is 61.

The square root of 126899989 is about 11264.9895250728. The cubic root of 126899989 is about 502.5205905608.

The spelling of 126899989 in words is "one hundred twenty-six million, eight hundred ninety-nine thousand, nine hundred eighty-nine".