1279543125 has 120 divisors (see below), whose sum is σ = 2614038240. Its totient is φ = 553392000.

The previous prime is 1279543123. The next prime is 1279543127. The reversal of 1279543125 is 5213459721.

It is an interprime number because it is at equal distance from previous prime (1279543123) and next prime (1279543127).

It is not a de Polignac number, because 1279543125 - 2¹ = 1279543123 is a prime.

It is a Curzon number.

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 in 119 ways as a sum of consecutive naturals, for example, 1745259 + ... + 1745991.

It is an arithmetic number, because the mean of its divisors is an integer number (21783652).

Almost surely, 2^1279543125 is an apocalyptic number.

1279543125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1279543125 is an abundant number, since it is smaller than the sum of its proper divisors (1334495115).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1279543125 is an equidigital number, since it uses as much as digits as its factorization.

1279543125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789 (or 767 counting only the distinct ones).

The product of its digits is 75600, while the sum is 39.

The square root of 1279543125 is about 35770.7020479051. The cubic root of 1279543125 is about 1085.6378490204.

The spelling of 1279543125 in words is "one billion, two hundred seventy-nine million, five hundred forty-three thousand, one hundred twenty-five".