155023223 has 4 divisors (see below), whose sum is σ = 163182360. Its totient is φ = 146864088.

The previous prime is 155023217. The next prime is 155023247. The reversal of 155023223 is 322320551.

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 155023223 - 2⁴ = 155023207 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 (155023273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4079540 + ... + 4079577.

It is an arithmetic number, because the mean of its divisors is an integer number (40795590).

Almost surely, 2^155023223 is an apocalyptic number.

155023223 is a deficient number, since it is larger than the sum of its proper divisors (8159137).

155023223 is an equidigital number, since it uses as much as digits as its factorization.

155023223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8159136.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 155023223 is about 12450.8322211810. The cubic root of 155023223 is about 537.1953613911.

Adding to 155023223 its reverse (322320551), we get a palindrome (477343774).

The spelling of 155023223 in words is "one hundred fifty-five million, twenty-three thousand, two hundred twenty-three".