1328161973 has 2 divisors, whose sum is σ = 1328161974. Its totient is φ = 1328161972.

The previous prime is 1328161903. The next prime is 1328161987. The reversal of 1328161973 is 3791618231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1320450244 + 7711729 = 36338^2 + 2777^2 .

It is a cyclic number.

It is not a de Polignac number, because 1328161973 - 2⁸ = 1328161717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1328161973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1328161903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664080986 + 664080987.

It is an arithmetic number, because the mean of its divisors is an integer number (664080987).

Almost surely, 2^1328161973 is an apocalyptic number.

It is an amenable number.

1328161973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328161973 is an equidigital number, since it uses as much as digits as its factorization.

1328161973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 1328161973 is about 36443.9566046279. The cubic root of 1328161973 is about 1099.2176180380.

The spelling of 1328161973 in words is "one billion, three hundred twenty-eight million, one hundred sixty-one thousand, nine hundred seventy-three".