1279708459849 has 4 divisors (see below), whose sum is σ = 1279710762880. Its totient is φ = 1279706156820.

The previous prime is 1279708459823. The next prime is 1279708459951. The reversal of 1279708459849 is 9489548079721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1279708459849 - 2²⁵ = 1279674905417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1279708459049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253072 + ... + 1619710.

It is an arithmetic number, because the mean of its divisors is an integer number (319927690720).

Almost surely, 2^{1279708459849} is an apocalyptic number.

It is an amenable number.

1279708459849 is a deficient number, since it is larger than the sum of its proper divisors (2303031).

1279708459849 is an equidigital number, since it uses as much as digits as its factorization.

1279708459849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2303030.

The product of its (nonzero) digits is 365783040, while the sum is 73.

The spelling of 1279708459849 in words is "one trillion, two hundred seventy-nine billion, seven hundred eight million, four hundred fifty-nine thousand, eight hundred forty-nine".