1281725684 has 12 divisors (see below), whose sum is σ = 2243480484. Its totient is φ = 640731264.

The previous prime is 1281725681. The next prime is 1281725701. The reversal of 1281725684 is 4865271821.

It can be written as a sum of positive squares in 2 ways, for example, as 1108224100 + 173501584 = 33290^2 + 13172^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281725681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9059 + ... + 51434.

It is an arithmetic number, because the mean of its divisors is an integer number (186956707).

Almost surely, 2^1281725684 is an apocalyptic number.

It is an amenable number.

1281725684 is a deficient number, since it is larger than the sum of its proper divisors (961754800).

1281725684 is a wasteful number, since it uses less digits than its factorization.

1281725684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65794 (or 65792 counting only the distinct ones).

The product of its digits is 215040, while the sum is 44.

The square root of 1281725684 is about 35801.1966839099. The cubic root of 1281725684 is about 1086.2547678409.

The spelling of 1281725684 in words is "one billion, two hundred eighty-one million, seven hundred twenty-five thousand, six hundred eighty-four".