155231323 has 4 divisors (see below), whose sum is σ = 167172208. Its totient is φ = 143290440.

The previous prime is 155231309. The next prime is 155231327. The reversal of 155231323 is 323132551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 323132551 = 7 ⋅46161793.

It is a cyclic number.

It is not a de Polignac number, because 155231323 - 2⁹ = 155230811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155231327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5970423 + ... + 5970448.

It is an arithmetic number, because the mean of its divisors is an integer number (41793052).

Almost surely, 2^155231323 is an apocalyptic number.

155231323 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

155231323 is a deficient number, since it is larger than the sum of its proper divisors (11940885).

155231323 is a wasteful number, since it uses less digits than its factorization.

155231323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11940884.

The product of its digits is 2700, while the sum is 25.

The square root of 155231323 is about 12459.1862896419. The cubic root of 155231323 is about 537.4356272647.

Adding to 155231323 its reverse (323132551), we get a palindrome (478363874).

The spelling of 155231323 in words is "one hundred fifty-five million, two hundred thirty-one thousand, three hundred twenty-three".