156442223 has 4 divisors (see below), whose sum is σ = 178791120. Its totient is φ = 134093328.

The previous prime is 156442207. The next prime is 156442243. The reversal of 156442223 is 322244651.

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 156442223 - 2⁴ = 156442207 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 (156442243) 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, 11174438 + ... + 11174451.

It is an arithmetic number, because the mean of its divisors is an integer number (44697780).

Almost surely, 2^156442223 is an apocalyptic number.

156442223 is a deficient number, since it is larger than the sum of its proper divisors (22348897).

156442223 is an equidigital number, since it uses as much as digits as its factorization.

156442223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22348896.

The product of its digits is 11520, while the sum is 29.

The square root of 156442223 is about 12507.6865566739. The cubic root of 156442223 is about 538.8294523426.

Adding to 156442223 its reverse (322244651), we get a palindrome (478686874).

The spelling of 156442223 in words is "one hundred fifty-six million, four hundred forty-two thousand, two hundred twenty-three".