1291316930 has 32 divisors (see below), whose sum is σ = 2443973040. Its totient is φ = 490533120.

The previous prime is 1291316921. The next prime is 1291316933. The reversal of 1291316930 is 396131921.

It can be written as a sum of positive squares in 8 ways, for example, as 137288089 + 1154028841 = 11717^2 + 33971^2 .

It is not an unprimeable number, because it can be changed into a prime (1291316933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18809 + ... + 54188.

Almost surely, 2^1291316930 is an apocalyptic number.

1291316930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1291316930 is a deficient number, since it is larger than the sum of its proper divisors (1152656110).

1291316930 is a wasteful number, since it uses less digits than its factorization.

1291316930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73094.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 1291316930 is about 35934.8984971434. The cubic root of 1291316930 is about 1088.9575449831.

The spelling of 1291316930 in words is "one billion, two hundred ninety-one million, three hundred sixteen thousand, nine hundred thirty".