161990735 has 8 divisors (see below), whose sum is σ = 194564400. Its totient is φ = 129475584.

The previous prime is 161990701. The next prime is 161990743. The reversal of 161990735 is 537099161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161990735 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161990692 and 161990701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8285 + ... + 19814.

It is an arithmetic number, because the mean of its divisors is an integer number (24320550).

Almost surely, 2^161990735 is an apocalyptic number.

161990735 is a deficient number, since it is larger than the sum of its proper divisors (32573665).

161990735 is a wasteful number, since it uses less digits than its factorization.

161990735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29257.

The product of its (nonzero) digits is 51030, while the sum is 41.

The square root of 161990735 is about 12727.5580925801. The cubic root of 161990735 is about 545.1257852921.

The spelling of 161990735 in words is "one hundred sixty-one million, nine hundred ninety thousand, seven hundred thirty-five".