161708399 has 2 divisors, whose sum is σ = 161708400. Its totient is φ = 161708398.

The previous prime is 161708383. The next prime is 161708419. The reversal of 161708399 is 993807161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161708399 - 2⁴ = 161708383 is a prime.

It is a super-2 number, since 2×161708399² = 52299212614286402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161708329) 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, 80854199 + 80854200.

It is an arithmetic number, because the mean of its divisors is an integer number (80854200).

Almost surely, 2^161708399 is an apocalyptic number.

161708399 is a deficient number, since it is larger than the sum of its proper divisors (1).

161708399 is an equidigital number, since it uses as much as digits as its factorization.

161708399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 161708399 is about 12716.4617327305. The cubic root of 161708399 is about 544.8088985744.

The spelling of 161708399 in words is "one hundred sixty-one million, seven hundred eight thousand, three hundred ninety-nine".