161320546 has 4 divisors (see below), whose sum is σ = 241980822. Its totient is φ = 80660272.

The previous prime is 161320541. The next prime is 161320547. The reversal of 161320546 is 645023161.

161320546 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 144600625 + 16719921 = 12025^2 + 4089^2 .

It is not an unprimeable number, because it can be changed into a prime (161320541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40330135 + ... + 40330138.

Almost surely, 2^161320546 is an apocalyptic number.

161320546 is a deficient number, since it is larger than the sum of its proper divisors (80660276).

161320546 is an equidigital number, since it uses as much as digits as its factorization.

161320546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80660275.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 161320546 is about 12701.2025414919. The cubic root of 161320546 is about 544.3729803218.

The spelling of 161320546 in words is "one hundred sixty-one million, three hundred twenty thousand, five hundred forty-six".