155603213 has 2 divisors, whose sum is σ = 155603214. Its totient is φ = 155603212.

The previous prime is 155603209. The next prime is 155603243. The reversal of 155603213 is 312306551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142038724 + 13564489 = 11918^2 + 3683^2 .

It is an emirp because it is prime and its reverse (312306551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155603213 - 2² = 155603209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155603243) 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 as a sum of consecutive naturals, namely, 77801606 + 77801607.

It is an arithmetic number, because the mean of its divisors is an integer number (77801607).

Almost surely, 2^155603213 is an apocalyptic number.

It is an amenable number.

155603213 is a deficient number, since it is larger than the sum of its proper divisors (1).

155603213 is an equidigital number, since it uses as much as digits as its factorization.

155603213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 155603213 is about 12474.1016911039. The cubic root of 155603213 is about 537.8644658427.

Adding to 155603213 its reverse (312306551), we get a palindrome (467909764).

The spelling of 155603213 in words is "one hundred fifty-five million, six hundred three thousand, two hundred thirteen".