215115255 has 24 divisors (see below), whose sum is σ = 373223760. Its totient is φ = 114618240.

The previous prime is 215115253. The next prime is 215115269. The reversal of 215115255 is 552511512.

It is not a de Polignac number, because 215115255 - 2¹ = 215115253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215115253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70920 + ... + 73890.

It is an arithmetic number, because the mean of its divisors is an integer number (15550990).

Almost surely, 2^215115255 is an apocalyptic number.

215115255 is a deficient number, since it is larger than the sum of its proper divisors (158108505).

215115255 is a wasteful number, since it uses less digits than its factorization.

215115255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4591 (or 4588 counting only the distinct ones).

The product of its digits is 2500, while the sum is 27.

The square root of 215115255 is about 14666.8079349257. The cubic root of 215115255 is about 599.1796706106.

Adding to 215115255 its reverse (552511512), we get a palindrome (767626767).

The spelling of 215115255 in words is "two hundred fifteen million, one hundred fifteen thousand, two hundred fifty-five".