1169891321 has 2 divisors, whose sum is σ = 1169891322. Its totient is φ = 1169891320.

The previous prime is 1169891287. The next prime is 1169891323. The reversal of 1169891321 is 1231989611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 964972096 + 204919225 = 31064^2 + 14315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1169891321 is a prime.

It is a super-2 number, since 2×1169891321² = 2737291405902250082, which contains 22 as substring.

Together with 1169891323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1169891323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 584945660 + 584945661.

It is an arithmetic number, because the mean of its divisors is an integer number (584945661).

Almost surely, 2^1169891321 is an apocalyptic number.

It is an amenable number.

1169891321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1169891321 is an equidigital number, since it uses as much as digits as its factorization.

1169891321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 41.

The square root of 1169891321 is about 34203.6740862732. The cubic root of 1169891321 is about 1053.6956157710.

The spelling of 1169891321 in words is "one billion, one hundred sixty-nine million, eight hundred ninety-one thousand, three hundred twenty-one".