161805873 has 8 divisors (see below), whose sum is σ = 219811968. Its totient is φ = 105835184.

The previous prime is 161805857. The next prime is 161805883. The reversal of 161805873 is 378508161.

161805873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 161805873 - 2⁴ = 161805857 is a prime.

It is a super-2 number, since 2×161805873² = 52362281074584258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161805883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 508665 + ... + 508982.

It is an arithmetic number, because the mean of its divisors is an integer number (27476496).

Almost surely, 2^161805873 is an apocalyptic number.

It is an amenable number.

161805873 is a deficient number, since it is larger than the sum of its proper divisors (58006095).

161805873 is a wasteful number, since it uses less digits than its factorization.

161805873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017703.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 161805873 is about 12720.2937466082. The cubic root of 161805873 is about 544.9183425620.

The spelling of 161805873 in words is "one hundred sixty-one million, eight hundred five thousand, eight hundred seventy-three".