1279543126 has 4 divisors (see below), whose sum is σ = 1919314692. Its totient is φ = 639771562.

The previous prime is 1279543123. The next prime is 1279543127. The reversal of 1279543126 is 6213459721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6213459721 = 7 ⋅887637103.

It is a super-2 number, since 2×1279543126² = 3274461222587703752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279543123) 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, 319885780 + ... + 319885783.

It is an arithmetic number, because the mean of its divisors is an integer number (479828673).

Almost surely, 2^1279543126 is an apocalyptic number.

1279543126 is a deficient number, since it is larger than the sum of its proper divisors (639771566).

1279543126 is an equidigital number, since it uses as much as digits as its factorization.

1279543126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639771565.

The product of its digits is 90720, while the sum is 40.

The square root of 1279543126 is about 35770.7020618830. The cubic root of 1279543126 is about 1085.6378493033.

The spelling of 1279543126 in words is "one billion, two hundred seventy-nine million, five hundred forty-three thousand, one hundred twenty-six".