126279991 has 2 divisors, whose sum is σ = 126279992. Its totient is φ = 126279990.

The previous prime is 126279931. The next prime is 126280003. The reversal of 126279991 is 199972621.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 126279991 - 2¹⁵ = 126247223 is a prime.

It is a super-2 number, since 2×126279991² = 31893272253920162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126279911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63139995 + 63139996.

It is an arithmetic number, because the mean of its divisors is an integer number (63139996).

Almost surely, 2^126279991 is an apocalyptic number.

126279991 is a deficient number, since it is larger than the sum of its proper divisors (1).

126279991 is an equidigital number, since it uses as much as digits as its factorization.

126279991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 46.

The square root of 126279991 is about 11237.4370298569. The cubic root of 126279991 is about 501.7008622413.

The spelling of 126279991 in words is "one hundred twenty-six million, two hundred seventy-nine thousand, nine hundred ninety-one".