1276661223 has 16 divisors (see below), whose sum is σ = 2002606560. Its totient is φ = 801042048.

The previous prime is 1276661219. The next prime is 1276661249. The reversal of 1276661223 is 3221666721.

It is not a de Polignac number, because 1276661223 - 2² = 1276661219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1276660223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1390240 + ... + 1391157.

It is an arithmetic number, because the mean of its divisors is an integer number (125162910).

Almost surely, 2^1276661223 is an apocalyptic number.

1276661223 is a deficient number, since it is larger than the sum of its proper divisors (725945337).

1276661223 is a wasteful number, since it uses less digits than its factorization.

1276661223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2781423 (or 2781417 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 1276661223 is about 35730.3963454088. The cubic root of 1276661223 is about 1084.8221793007.

The spelling of 1276661223 in words is "one billion, two hundred seventy-six million, six hundred sixty-one thousand, two hundred twenty-three".