1280357877841 has 27 divisors (see below), whose sum is σ = 1504199735451. Its totient is φ = 1086648033744.

The previous prime is 1280357877823. The next prime is 1280357877881. The reversal of 1280357877841 is 1487787530821.

The square root of 1280357877841 is 1131529.

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., 892403298241 + 387954579600 = 944671^2 + 622860^2 .

It is not a de Polignac number, because 1280357877841 - 2²³ = 1280349489233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1280357877841.

It is not an unprimeable number, because it can be changed into a prime (1280357877881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 863355886 + ... + 863357368.

It is an arithmetic number, because the mean of its divisors is an integer number (55711101313).

Almost surely, 2^{1280357877841} is an apocalyptic number.

1280357877841 is the 1131529-th square number.

1280357877841 is the 565765-th centered octagonal number.

It is an amenable number.

1280357877841 is a deficient number, since it is larger than the sum of its proper divisors (223841857610).

1280357877841 is an frugal number, since it uses more digits than its factorization.

1280357877841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3198 (or 1599 counting only the distinct ones).

The product of its (nonzero) digits is 21073920, while the sum is 61.

The spelling of 1280357877841 in words is "one trillion, two hundred eighty billion, three hundred fifty-seven million, eight hundred seventy-seven thousand, eight hundred forty-one".