1322117891 has 2 divisors, whose sum is σ = 1322117892. Its totient is φ = 1322117890.

The previous prime is 1322117887. The next prime is 1322117899. The reversal of 1322117891 is 1987112231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1322117891 - 2² = 1322117887 is a prime.

It is not a weakly prime, because it can be changed into another prime (1322117899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661058945 + 661058946.

It is an arithmetic number, because the mean of its divisors is an integer number (661058946).

Almost surely, 2^1322117891 is an apocalyptic number.

1322117891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1322117891 is an equidigital number, since it uses as much as digits as its factorization.

1322117891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 35.

The square root of 1322117891 is about 36360.9390830325. The cubic root of 1322117891 is about 1097.5476748990.

The spelling of 1322117891 in words is "one billion, three hundred twenty-two million, one hundred seventeen thousand, eight hundred ninety-one".