161790806 has 4 divisors (see below), whose sum is σ = 242686212. Its totient is φ = 80895402.

The previous prime is 161790787. The next prime is 161790823. The reversal of 161790806 is 608097161.

161790806 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×161790806² = 52352529812259272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161790806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40447700 + ... + 40447703.

It is an arithmetic number, because the mean of its divisors is an integer number (60671553).

Almost surely, 2^161790806 is an apocalyptic number.

161790806 is a deficient number, since it is larger than the sum of its proper divisors (80895406).

161790806 is an equidigital number, since it uses as much as digits as its factorization.

161790806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80895405.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 161790806 is about 12719.7014902080. The cubic root of 161790806 is about 544.9014281790.

The spelling of 161790806 in words is "one hundred sixty-one million, seven hundred ninety thousand, eight hundred six".