1291193226 has 12 divisors (see below), whose sum is σ = 2797585362. Its totient is φ = 430397736.

The previous prime is 1291193219. The next prime is 1291193227. The reversal of 1291193226 is 6223911921.

It can be written as a sum of positive squares in only one way, i.e., 796086225 + 495107001 = 28215^2 + 22251^2 .

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1291193227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35866461 + ... + 35866496.

Almost surely, 2^1291193226 is an apocalyptic number.

1291193226 is an abundant number, since it is smaller than the sum of its proper divisors (1506392136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1291193226 is a wasteful number, since it uses less digits than its factorization.

1291193226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71732965 (or 71732962 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 1291193226 is about 35933.1772321903. The cubic root of 1291193226 is about 1088.9227709982.

The spelling of 1291193226 in words is "one billion, two hundred ninety-one million, one hundred ninety-three thousand, two hundred twenty-six".