1281078983 has 4 divisors (see below), whose sum is σ = 1287582120. Its totient is φ = 1274575848.

The previous prime is 1281078961. The next prime is 1281079069. The reversal of 1281078983 is 3898701821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3898701821 = 7 ⋅556957403.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1281078983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281078943) 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, 3251273 + ... + 3251666.

It is an arithmetic number, because the mean of its divisors is an integer number (321895530).

Almost surely, 2^1281078983 is an apocalyptic number.

1281078983 is a deficient number, since it is larger than the sum of its proper divisors (6503137).

1281078983 is an equidigital number, since it uses as much as digits as its factorization.

1281078983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6503136.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 1281078983 is about 35792.1637093931. The cubic root of 1281078983 is about 1086.0720453771.

The spelling of 1281078983 in words is "one billion, two hundred eighty-one million, seventy-eight thousand, nine hundred eighty-three".