155223013 has 4 divisors (see below), whose sum is σ = 169334208. Its totient is φ = 141111820.

The previous prime is 155223011. The next prime is 155223023. The reversal of 155223013 is 310322551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155223013 - 2¹ = 155223011 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155223011) 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, 7055581 + ... + 7055602.

It is an arithmetic number, because the mean of its divisors is an integer number (42333552).

Almost surely, 2^155223013 is an apocalyptic number.

It is an amenable number.

155223013 is a deficient number, since it is larger than the sum of its proper divisors (14111195).

155223013 is a wasteful number, since it uses less digits than its factorization.

155223013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14111194.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 155223013 is about 12458.8527963051. The cubic root of 155223013 is about 537.4260369112.

Adding to 155223013 its reverse (310322551), we get a palindrome (465545564).

The spelling of 155223013 in words is "one hundred fifty-five million, two hundred twenty-three thousand, thirteen".