1312551266 has 16 divisors (see below), whose sum is σ = 2244997944. Its totient is φ = 570157824.

The previous prime is 1312551259. The next prime is 1312551269. The reversal of 1312551266 is 6621552131.

It can be written as a sum of positive squares in 4 ways, for example, as 1114558225 + 197993041 = 33385^2 + 14071^2 .

It is not an unprimeable number, because it can be changed into a prime (1312551269) 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 7 ways as a sum of consecutive naturals, for example, 1484345 + ... + 1485228.

Almost surely, 2^1312551266 is an apocalyptic number.

1312551266 is a deficient number, since it is larger than the sum of its proper divisors (932446678).

1312551266 is a wasteful number, since it uses less digits than its factorization.

1312551266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2969605.

The product of its digits is 10800, while the sum is 32.

The square root of 1312551266 is about 36229.1493965840. The cubic root of 1312551266 is about 1094.8940400517.

The spelling of 1312551266 in words is "one billion, three hundred twelve million, five hundred fifty-one thousand, two hundred sixty-six".