155231223 has 32 divisors (see below), whose sum is σ = 242514432. Its totient is φ = 86486400.

The previous prime is 155231143. The next prime is 155231227. The reversal of 155231223 is 322132551.

It is a happy number.

155231223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 155231223 - 2¹⁰ = 155230199 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155231193 and 155231202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155231227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 234513 + ... + 235173.

It is an arithmetic number, because the mean of its divisors is an integer number (7578576).

Almost surely, 2^155231223 is an apocalyptic number.

155231223 is a deficient number, since it is larger than the sum of its proper divisors (87283209).

155231223 is a wasteful number, since it uses less digits than its factorization.

155231223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935.

The product of its digits is 1800, while the sum is 24.

The square root of 155231223 is about 12459.1822765381. The cubic root of 155231223 is about 537.4355118593.

Adding to 155231223 its reverse (322132551), we get a palindrome (477363774).

The spelling of 155231223 in words is "one hundred fifty-five million, two hundred thirty-one thousand, two hundred twenty-three".