1278706081 has 3 divisors (see below), whose sum is σ = 1278741841. Its totient is φ = 1278670322.

The previous prime is 1278706067. The next prime is 1278706103. The reversal of 1278706081 is 1806078721.

The square root of 1278706081 is 35759.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1278706081 - 2⁵ = 1278706049 is a prime.

It is a super-2 number, since 2×1278706081² = 3270178483172757122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278706021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 17880 + ... + 53638.

Almost surely, 2^1278706081 is an apocalyptic number.

1278706081 is the 35759-th square number.

1278706081 is the 17880-th centered octagonal number.

It is an amenable number.

1278706081 is a deficient number, since it is larger than the sum of its proper divisors (35760).

1278706081 is an frugal number, since it uses more digits than its factorization.

1278706081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71518 (or 35759 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 40.

The cubic root of 1278706081 is about 1085.4010653182.

The spelling of 1278706081 in words is "one billion, two hundred seventy-eight million, seven hundred six thousand, eighty-one".