161586538 has 8 divisors (see below), whose sum is σ = 242503488. Its totient is φ = 80752044.

The previous prime is 161586487. The next prime is 161586553. The reversal of 161586538 is 835685161.

161586538 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 super-2 number, since 2×161586538² = 52220418525650888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161586494 and 161586503.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15456 + ... + 23707.

It is an arithmetic number, because the mean of its divisors is an integer number (30312936).

Almost surely, 2^161586538 is an apocalyptic number.

161586538 is a deficient number, since it is larger than the sum of its proper divisors (80916950).

161586538 is a wasteful number, since it uses less digits than its factorization.

161586538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41228.

The product of its digits is 172800, while the sum is 43.

The square root of 161586538 is about 12711.6693632268. The cubic root of 161586538 is about 544.6720109387.

The spelling of 161586538 in words is "one hundred sixty-one million, five hundred eighty-six thousand, five hundred thirty-eight".