155135215 has 4 divisors (see below), whose sum is σ = 186162264. Its totient is φ = 124108168.

The previous prime is 155135179. The next prime is 155135221. The reversal of 155135215 is 512531551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155135215 - 2¹⁹ = 154610927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15513517 + ... + 15513526.

It is an arithmetic number, because the mean of its divisors is an integer number (46540566).

Almost surely, 2^155135215 is an apocalyptic number.

155135215 is a deficient number, since it is larger than the sum of its proper divisors (31027049).

155135215 is an equidigital number, since it uses as much as digits as its factorization.

155135215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31027048.

The product of its digits is 3750, while the sum is 28.

The square root of 155135215 is about 12455.3287792816. The cubic root of 155135215 is about 537.3246906194.

Adding to 155135215 its reverse (512531551), we get a palindrome (667666766).

The spelling of 155135215 in words is "one hundred fifty-five million, one hundred thirty-five thousand, two hundred fifteen".