161829887 has 4 divisors (see below), whose sum is σ = 162198960. Its totient is φ = 161460816.

The previous prime is 161829839. The next prime is 161829929. The reversal of 161829887 is 788928161.

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

It is a cyclic number.

It is not a de Polignac number, because 161829887 - 2¹⁴ = 161813503 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 (161829287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183878 + ... + 184755.

It is an arithmetic number, because the mean of its divisors is an integer number (40549740).

Almost surely, 2^161829887 is an apocalyptic number.

161829887 is a deficient number, since it is larger than the sum of its proper divisors (369073).

161829887 is an equidigital number, since it uses as much as digits as its factorization.

161829887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369072.

The product of its digits is 387072, while the sum is 50.

The square root of 161829887 is about 12721.2376363308. The cubic root of 161829887 is about 544.9452987772.

The spelling of 161829887 in words is "one hundred sixty-one million, eight hundred twenty-nine thousand, eight hundred eighty-seven".