161990359 has 8 divisors (see below), whose sum is σ = 163796112. Its totient is φ = 160191360.

The previous prime is 161990293. The next prime is 161990377. The reversal of 161990359 is 953099161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161990359 - 2¹¹ = 161988311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161999359) 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 in 7 ways as a sum of consecutive naturals, for example, 57729 + ... + 60469.

It is an arithmetic number, because the mean of its divisors is an integer number (20474514).

Almost surely, 2^161990359 is an apocalyptic number.

161990359 is a deficient number, since it is larger than the sum of its proper divisors (1805753).

161990359 is a wasteful number, since it uses less digits than its factorization.

161990359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3377.

The product of its (nonzero) digits is 65610, while the sum is 43.

The square root of 161990359 is about 12727.5433214741. The cubic root of 161990359 is about 545.1253635242.

The spelling of 161990359 in words is "one hundred sixty-one million, nine hundred ninety thousand, three hundred fifty-nine".