1321118917 has 2 divisors, whose sum is σ = 1321118918. Its totient is φ = 1321118916.

The previous prime is 1321118881. The next prime is 1321118921. The reversal of 1321118917 is 7198111231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1307473281 + 13645636 = 36159^2 + 3694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321118917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321118927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660559458 + 660559459.

It is an arithmetic number, because the mean of its divisors is an integer number (660559459).

Almost surely, 2^1321118917 is an apocalyptic number.

It is an amenable number.

1321118917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321118917 is an equidigital number, since it uses as much as digits as its factorization.

1321118917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 34.

The square root of 1321118917 is about 36347.1995757582. The cubic root of 1321118917 is about 1097.2711746309.

The spelling of 1321118917 in words is "one billion, three hundred twenty-one million, one hundred eighteen thousand, nine hundred seventeen".