1280418049 has 4 divisors (see below), whose sum is σ = 1280574036. Its totient is φ = 1280262064.

The previous prime is 1280418023. The next prime is 1280418091. The reversal of 1280418049 is 9408140821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 662547600 + 617870449 = 25740^2 + 24857^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280418049 - 2⁷ = 1280417921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1280417999 and 1280418017.

It is not an unprimeable number, because it can be changed into a prime (1280418449) 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, 64954 + ... + 82339.

It is an arithmetic number, because the mean of its divisors is an integer number (320143509).

Almost surely, 2^1280418049 is an apocalyptic number.

It is an amenable number.

1280418049 is a deficient number, since it is larger than the sum of its proper divisors (155987).

1280418049 is an equidigital number, since it uses as much as digits as its factorization.

1280418049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155986.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 1280418049 is about 35782.9295754274. The cubic root of 1280418049 is about 1085.8852378937.

The spelling of 1280418049 in words is "one billion, two hundred eighty million, four hundred eighteen thousand, forty-nine".