1279358945 has 16 divisors (see below), whose sum is σ = 1558239312. Its totient is φ = 1008184320.

The previous prime is 1279358921. The next prime is 1279358959. The reversal of 1279358945 is 5498539721.

It can be written as a sum of positive squares in 8 ways, for example, as 8579041 + 1270779904 = 2929^2 + 35648^2 .

It is not a de Polignac number, because 1279358945 - 2⁶ = 1279358881 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 370949 + ... + 374381.

It is an arithmetic number, because the mean of its divisors is an integer number (97389957).

Almost surely, 2^1279358945 is an apocalyptic number.

It is an amenable number.

1279358945 is a deficient number, since it is larger than the sum of its proper divisors (278880367).

1279358945 is a wasteful number, since it uses less digits than its factorization.

1279358945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4532.

The product of its digits is 2721600, while the sum is 53.

The square root of 1279358945 is about 35768.1275020094. The cubic root of 1279358945 is about 1085.5857568922.

The spelling of 1279358945 in words is "one billion, two hundred seventy-nine million, three hundred fifty-eight thousand, nine hundred forty-five".