1217731012 has 12 divisors (see below), whose sum is σ = 2256384060. Its totient is φ = 573049856.

The previous prime is 1217731001. The next prime is 1217731027. The reversal of 1217731012 is 2101377121.

It can be written as a sum of positive squares in 2 ways, for example, as 947654656 + 270076356 = 30784^2 + 16434^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8953837 + ... + 8953972.

It is an arithmetic number, because the mean of its divisors is an integer number (188032005).

Almost surely, 2^1217731012 is an apocalyptic number.

It is an amenable number.

1217731012 is a deficient number, since it is larger than the sum of its proper divisors (1038653048).

1217731012 is a wasteful number, since it uses less digits than its factorization.

1217731012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17907830 (or 17907828 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 1217731012 is about 34896.0028083447. The cubic root of 1217731012 is about 1067.8668925182.

The spelling of 1217731012 in words is "one billion, two hundred seventeen million, seven hundred thirty-one thousand, twelve".