161015223 has 4 divisors (see below), whose sum is σ = 214686968. Its totient is φ = 107343480.

The previous prime is 161015213. The next prime is 161015227. The reversal of 161015223 is 322510161.

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

It is not a de Polignac number, because 161015223 - 2⁴ = 161015207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161015223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161015227) 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, 26835868 + ... + 26835873.

It is an arithmetic number, because the mean of its divisors is an integer number (53671742).

Almost surely, 2^161015223 is an apocalyptic number.

161015223 is a deficient number, since it is larger than the sum of its proper divisors (53671745).

161015223 is an equidigital number, since it uses as much as digits as its factorization.

161015223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53671744.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 161015223 is about 12689.1773965060. The cubic root of 161015223 is about 544.0293279586.

Adding to 161015223 its reverse (322510161), we get a palindrome (483525384).

The spelling of 161015223 in words is "one hundred sixty-one million, fifteen thousand, two hundred twenty-three".