155503213 has 16 divisors (see below), whose sum is σ = 163846656. Its totient is φ = 147450240.

The previous prime is 155503171. The next prime is 155503259. The reversal of 155503213 is 312305551.

It is a cyclic number.

It is not a de Polignac number, because 155503213 - 2²¹ = 153406061 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 (155504213) 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 in 15 ways as a sum of consecutive naturals, for example, 208920 + ... + 209662.

It is an arithmetic number, because the mean of its divisors is an integer number (10240416).

Almost surely, 2^155503213 is an apocalyptic number.

It is an amenable number.

155503213 is a deficient number, since it is larger than the sum of its proper divisors (8343443).

155503213 is an equidigital number, since it uses as much as digits as its factorization.

155503213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924.

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

The square root of 155503213 is about 12470.0927422373. The cubic root of 155503213 is about 537.7492197802.

Adding to 155503213 its reverse (312305551), we get a palindrome (467808764).

The spelling of 155503213 in words is "one hundred fifty-five million, five hundred three thousand, two hundred thirteen".