1281204755 has 4 divisors (see below), whose sum is σ = 1537445712. Its totient is φ = 1024963800.

The previous prime is 1281204709. The next prime is 1281204761. The reversal of 1281204755 is 5574021821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5574021821 = 29 ⋅192207649.

It is not a de Polignac number, because 1281204755 - 2¹² = 1281200659 is a prime.

It is a super-2 number, since 2×1281204755² = 3282971248469220050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128120471 + ... + 128120480.

It is an arithmetic number, because the mean of its divisors is an integer number (384361428).

Almost surely, 2^1281204755 is an apocalyptic number.

1281204755 is a deficient number, since it is larger than the sum of its proper divisors (256240957).

1281204755 is an equidigital number, since it uses as much as digits as its factorization.

1281204755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256240956.

The product of its (nonzero) digits is 22400, while the sum is 35.

The square root of 1281204755 is about 35793.9206430366. The cubic root of 1281204755 is about 1086.1075865070.

The spelling of 1281204755 in words is "one billion, two hundred eighty-one million, two hundred four thousand, seven hundred fifty-five".