1280541867 has 16 divisors (see below), whose sum is σ = 1880019072. Its totient is φ = 768830720.

The previous prime is 1280541863. The next prime is 1280541869. The reversal of 1280541867 is 7681450821.

It is a cyclic number.

It is not a de Polignac number, because 1280541867 - 2² = 1280541863 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1280541863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177798 + ... + 184859.

It is an arithmetic number, because the mean of its divisors is an integer number (117501192).

Almost surely, 2^1280541867 is an apocalyptic number.

1280541867 is a deficient number, since it is larger than the sum of its proper divisors (599477205).

1280541867 is a wasteful number, since it uses less digits than its factorization.

1280541867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362778.

The product of its (nonzero) digits is 107520, while the sum is 42.

The square root of 1280541867 is about 35784.6596602511. The cubic root of 1280541867 is about 1085.9202389115.

It can be divided in two parts, 128054 and 1867, that added together give a palindrome (129921).

The spelling of 1280541867 in words is "one billion, two hundred eighty million, five hundred forty-one thousand, eight hundred sixty-seven".