1279951849 has 4 divisors (see below), whose sum is σ = 1396311120. Its totient is φ = 1163592580.

The previous prime is 1279951823. The next prime is 1279951867. The reversal of 1279951849 is 9481599721.

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 1279951849 - 2⁷ = 1279951721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1279951849.

It is not an unprimeable number, because it can be changed into a prime (1279951819) 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, 58179619 + ... + 58179640.

It is an arithmetic number, because the mean of its divisors is an integer number (349077780).

Almost surely, 2^1279951849 is an apocalyptic number.

It is an amenable number.

1279951849 is a deficient number, since it is larger than the sum of its proper divisors (116359271).

1279951849 is a wasteful number, since it uses less digits than its factorization.

1279951849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116359270.

The product of its digits is 1632960, while the sum is 55.

The square root of 1279951849 is about 35776.4147029855. The cubic root of 1279951849 is about 1085.7534316836.

It can be divided in two parts, 1279951 and 849, that added together give a triangular number (1280800 = T₁₆₀₀).

The spelling of 1279951849 in words is "one billion, two hundred seventy-nine million, nine hundred fifty-one thousand, eight hundred forty-nine".