1279741825 has 12 divisors (see below), whose sum is σ = 1587515580. Its totient is φ = 1023383360.

The previous prime is 1279741717. The next prime is 1279741847. The reversal of 1279741825 is 5281479721.

It can be written as a sum of positive squares in 6 ways, for example, as 77316849 + 1202424976 = 8793^2 + 34676^2 .

It is not a de Polignac number, because 1279741825 - 2²³ = 1271353217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63927 + ... + 81523.

It is an arithmetic number, because the mean of its divisors is an integer number (132292965).

Almost surely, 2^1279741825 is an apocalyptic number.

It is an amenable number.

1279741825 is a deficient number, since it is larger than the sum of its proper divisors (307773755).

1279741825 is a wasteful number, since it uses less digits than its factorization.

1279741825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20516 (or 20511 counting only the distinct ones).

The product of its digits is 282240, while the sum is 46.

The square root of 1279741825 is about 35773.4793527272. The cubic root of 1279741825 is about 1085.6940422744.

The spelling of 1279741825 in words is "one billion, two hundred seventy-nine million, seven hundred forty-one thousand, eight hundred twenty-five".