161999359 has 2 divisors, whose sum is σ = 161999360. Its totient is φ = 161999358.

The previous prime is 161999353. The next prime is 161999401. The reversal of 161999359 is 953999161.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161999359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161999353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80999679 + 80999680.

It is an arithmetic number, because the mean of its divisors is an integer number (80999680).

Almost surely, 2^161999359 is an apocalyptic number.

161999359 is a deficient number, since it is larger than the sum of its proper divisors (1).

161999359 is an equidigital number, since it uses as much as digits as its factorization.

161999359 is an evil number, because the sum of its binary digits is even.

The product of its digits is 590490, while the sum is 52.

The square root of 161999359 is about 12727.8968804748. The cubic root of 161999359 is about 545.1354588522.

The spelling of 161999359 in words is "one hundred sixty-one million, nine hundred ninety-nine thousand, three hundred fifty-nine".