1328322161 has 2 divisors, whose sum is σ = 1328322162. Its totient is φ = 1328322160.

The previous prime is 1328322157. The next prime is 1328322221. The reversal of 1328322161 is 1612238231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 724686400 + 603635761 = 26920^2 + 24569^2 .

It is a cyclic number.

It is not a de Polignac number, because 1328322161 - 2² = 1328322157 is a prime.

It is a super-3 number, since 3×1328322161³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1328382161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664161080 + 664161081.

It is an arithmetic number, because the mean of its divisors is an integer number (664161081).

Almost surely, 2^1328322161 is an apocalyptic number.

It is an amenable number.

1328322161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328322161 is an equidigital number, since it uses as much as digits as its factorization.

1328322161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 1328322161 is about 36446.1542690035. The cubic root of 1328322161 is about 1099.2618080281.

The spelling of 1328322161 in words is "one billion, three hundred twenty-eight million, three hundred twenty-two thousand, one hundred sixty-one".