1276585879321 has 3 divisors (see below), whose sum is σ = 1276587009183. Its totient is φ = 1276584749460.

The previous prime is 1276585879301. The next prime is 1276585879333. The reversal of 1276585879321 is 1239785856721.

The square root of 1276585879321 is 1129861.

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 can be written as a sum of positive squares in only one way, i.e., 219596269321 + 1056989610000 = 468611^2 + 1028100^2 .

It is not a de Polignac number, because 1276585879321 - 2⁷ = 1276585879193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1276585879301) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 564931 + ... + 1694791.

It is an arithmetic number, because the mean of its divisors is an integer number (425529003061).

Almost surely, 2^{1276585879321} is an apocalyptic number.

1276585879321 is the 1129861-st square number.

1276585879321 is the 564931-st centered octagonal number.

It is an amenable number.

1276585879321 is a deficient number, since it is larger than the sum of its proper divisors (1129862).

1276585879321 is an frugal number, since it uses more digits than its factorization.

1276585879321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2259722 (or 1129861 counting only the distinct ones).

The product of its digits is 50803200, while the sum is 64.

Multiplying 1276585879321 by its sum of digits (64), we get a square (81701496276544 = 9038888²).

The spelling of 1276585879321 in words is "one trillion, two hundred seventy-six billion, five hundred eighty-five million, eight hundred seventy-nine thousand, three hundred twenty-one".