1286781255 has 32 divisors (see below), whose sum is σ = 2422180800. Its totient is φ = 645912576.

The previous prime is 1286781239. The next prime is 1286781257. The reversal of 1286781255 is 5521876821.

1286781255 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1286781255 - 2⁴ = 1286781239 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1286781255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1286781257) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 278050 + ... + 282639.

It is an arithmetic number, because the mean of its divisors is an integer number (75693150).

Almost surely, 2^1286781255 is an apocalyptic number.

1286781255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1286781255 is a deficient number, since it is larger than the sum of its proper divisors (1135399545).

1286781255 is a wasteful number, since it uses less digits than its factorization.

1286781255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560720 (or 560714 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The square root of 1286781255 is about 35871.7333704409. The cubic root of 1286781255 is about 1087.6810828065.

The spelling of 1286781255 in words is "one billion, two hundred eighty-six million, seven hundred eighty-one thousand, two hundred fifty-five".