1280136841 has 9 divisors (see below), whose sum is σ = 1317032199. Its totient is φ = 1244250504.

The previous prime is 1280136827. The next prime is 1280136853. The reversal of 1280136841 is 1486310821.

The square root of 1280136841 is 35779.

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

It can be written as a sum of positive squares in only one way, i.e., 1145484025 + 134652816 = 33845^2 + 11604^2 .

It is not a de Polignac number, because 1280136841 - 2⁷ = 1280136713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1280136797 and 1280136806.

It is not an unprimeable number, because it can be changed into a prime (1280139841) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1323340 + ... + 1324306.

It is an arithmetic number, because the mean of its divisors is an integer number (146336911).

Almost surely, 2^1280136841 is an apocalyptic number.

1280136841 is the 35779-th square number.

1280136841 is the 17890-th centered octagonal number.

It is an amenable number.

1280136841 is a deficient number, since it is larger than the sum of its proper divisors (36895358).

1280136841 is an frugal number, since it uses more digits than its factorization.

1280136841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2008 (or 1004 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The cubic root of 1280136841 is about 1085.8057373031.

Multiplying 1280136841 by its product of nonzero digits (9216), we get a square (11797741126656 = 3434784²).

The spelling of 1280136841 in words is "one billion, two hundred eighty million, one hundred thirty-six thousand, eight hundred forty-one".