126431999 has 2 divisors, whose sum is σ = 126432000. Its totient is φ = 126431998.

The previous prime is 126431983. The next prime is 126432011. The reversal of 126431999 is 999134621.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 126431999 - 2⁴ = 126431983 is a prime.

It is a super-2 number, since 2×126431999² = 31970100742272002, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126431959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63215999 + 63216000.

It is an arithmetic number, because the mean of its divisors is an integer number (63216000).

Almost surely, 2^126431999 is an apocalyptic number.

126431999 is a deficient number, since it is larger than the sum of its proper divisors (1).

126431999 is an equidigital number, since it uses as much as digits as its factorization.

126431999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 44.

The square root of 126431999 is about 11244.1984596502. The cubic root of 126431999 is about 501.9020869549.

The spelling of 126431999 in words is "one hundred twenty-six million, four hundred thirty-one thousand, nine hundred ninety-nine".