155530213 has 2 divisors, whose sum is σ = 155530214. Its totient is φ = 155530212.

The previous prime is 155530211. The next prime is 155530231. The reversal of 155530213 is 312035551.

155530213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (155530231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102779044 + 52751169 = 10138^2 + 7263^2 .

It is a cyclic number.

It is not a de Polignac number, because 155530213 - 2¹ = 155530211 is a prime.

Together with 155530211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155530211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77765106 + 77765107.

It is an arithmetic number, because the mean of its divisors is an integer number (77765107).

Almost surely, 2^155530213 is an apocalyptic number.

It is an amenable number.

155530213 is a deficient number, since it is larger than the sum of its proper divisors (1).

155530213 is an equidigital number, since it uses as much as digits as its factorization.

155530213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 155530213 is about 12471.1752854332. The cubic root of 155530213 is about 537.7803410850.

Adding to 155530213 its reverse (312035551), we get a palindrome (467565764).

The spelling of 155530213 in words is "one hundred fifty-five million, five hundred thirty thousand, two hundred thirteen".