155230213 has 4 divisors (see below), whose sum is σ = 164361420. Its totient is φ = 146099008.

The previous prime is 155230199. The next prime is 155230219. The reversal of 155230213 is 312032551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312032551 = 1223 ⋅255137.

It can be written as a sum of positive squares in 2 ways, for example, as 141562404 + 13667809 = 11898^2 + 3697^2 .

It is a cyclic number.

It is not a de Polignac number, because 155230213 - 2²¹ = 153133061 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 (155230219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4565578 + ... + 4565611.

It is an arithmetic number, because the mean of its divisors is an integer number (41090355).

Almost surely, 2^155230213 is an apocalyptic number.

It is an amenable number.

155230213 is a deficient number, since it is larger than the sum of its proper divisors (9131207).

155230213 is an equidigital number, since it uses as much as digits as its factorization.

155230213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9131206.

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

The square root of 155230213 is about 12459.1417441170. The cubic root of 155230213 is about 537.4343462625.

Adding to 155230213 its reverse (312032551), we get a palindrome (467262764).

The spelling of 155230213 in words is "one hundred fifty-five million, two hundred thirty thousand, two hundred thirteen".