155223023 has 2 divisors, whose sum is σ = 155223024. Its totient is φ = 155223022.

The previous prime is 155223011. The next prime is 155223037. The reversal of 155223023 is 320322551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155223023 - 2⁶ = 155222959 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155223023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155223053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77611511 + 77611512.

It is an arithmetic number, because the mean of its divisors is an integer number (77611512).

Almost surely, 2^155223023 is an apocalyptic number.

155223023 is a deficient number, since it is larger than the sum of its proper divisors (1).

155223023 is an equidigital number, since it uses as much as digits as its factorization.

155223023 is an odious number, because the sum of its binary digits is odd.

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

The square root of 155223023 is about 12458.8531976262. The cubic root of 155223023 is about 537.4260484522.

Adding to 155223023 its reverse (320322551), we get a palindrome (475545574).

The spelling of 155223023 in words is "one hundred fifty-five million, two hundred twenty-three thousand, twenty-three".