1280566225 has 27 divisors (see below), whose sum is σ = 1690818771. Its totient is φ = 961900800.

The previous prime is 1280566223. The next prime is 1280566271. The reversal of 1280566225 is 5226650821.

The square root of 1280566225 is 35785.

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

It can be written as a sum of positive squares in 13 ways, for example, as 1218219409 + 62346816 = 34903^2 + 7896^2 .

It is not a de Polignac number, because 1280566225 - 2¹ = 1280566223 is a prime.

It is a super-2 number, since 2×1280566225² = 3279699713221501250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280566223) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3041515 + ... + 3041935.

Almost surely, 2^1280566225 is an apocalyptic number.

1280566225 is the 35785-th square number.

1280566225 is the 17893-rd centered octagonal number.

It is an amenable number.

1280566225 is a deficient number, since it is larger than the sum of its proper divisors (410252546).

1280566225 is an frugal number, since it uses more digits than its factorization.

1280566225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886 (or 443 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The cubic root of 1280566225 is about 1085.9271241939.

Multiplying 1280566225 by its product of nonzero digits (57600), we get a square (73760614560000 = 8588400²).

The spelling of 1280566225 in words is "one billion, two hundred eighty million, five hundred sixty-six thousand, two hundred twenty-five".