1163221391 has 2 divisors, whose sum is σ = 1163221392. Its totient is φ = 1163221390.

The previous prime is 1163221357. The next prime is 1163221393. The reversal of 1163221391 is 1931223611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1163221391 - 2²² = 1159027087 is a prime.

Together with 1163221393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1163221393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 581610695 + 581610696.

It is an arithmetic number, because the mean of its divisors is an integer number (581610696).

Almost surely, 2^1163221391 is an apocalyptic number.

1163221391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1163221391 is an equidigital number, since it uses as much as digits as its factorization.

1163221391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 29.

The square root of 1163221391 is about 34106.0315926670. The cubic root of 1163221391 is about 1051.6893112007.

The spelling of 1163221391 in words is "one billion, one hundred sixty-three million, two hundred twenty-one thousand, three hundred ninety-one".