161323373 has 2 divisors, whose sum is σ = 161323374. Its totient is φ = 161323372.

The previous prime is 161323333. The next prime is 161323427. The reversal of 161323373 is 373323161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129095044 + 32228329 = 11362^2 + 5677^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161323373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161323303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80661686 + 80661687.

It is an arithmetic number, because the mean of its divisors is an integer number (80661687).

Almost surely, 2^161323373 is an apocalyptic number.

It is an amenable number.

161323373 is a deficient number, since it is larger than the sum of its proper divisors (1).

161323373 is an equidigital number, since it uses as much as digits as its factorization.

161323373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 29.

The square root of 161323373 is about 12701.3138296792. The cubic root of 161323373 is about 544.3761601884.

The spelling of 161323373 in words is "one hundred sixty-one million, three hundred twenty-three thousand, three hundred seventy-three".