1281755313 has 16 divisors (see below), whose sum is σ = 1899475200. Its totient is φ = 854243280.

The previous prime is 1281755297. The next prime is 1281755317. The reversal of 1281755313 is 3135571821.

It is a happy number.

1281755313 is a `hidden beast` number, since 12 + 81 + 7 + 553 + 13 = 666.

It is not a de Polignac number, because 1281755313 - 2⁴ = 1281755297 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1281755317) 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, 131343 + ... + 140763.

It is an arithmetic number, because the mean of its divisors is an integer number (118717200).

Almost surely, 2^1281755313 is an apocalyptic number.

It is an amenable number.

1281755313 is a deficient number, since it is larger than the sum of its proper divisors (617719887).

1281755313 is an equidigital number, since it uses as much as digits as its factorization.

1281755313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14469 (or 14463 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 1281755313 is about 35801.6104805356. The cubic root of 1281755313 is about 1086.2631379092.

The spelling of 1281755313 in words is "one billion, two hundred eighty-one million, seven hundred fifty-five thousand, three hundred thirteen".