215231075 has 24 divisors (see below), whose sum is σ = 270972240. Its totient is φ = 169574400.

The previous prime is 215231059. The next prime is 215231087. The reversal of 215231075 is 570132512.

It is not a de Polignac number, because 215231075 - 2⁴ = 215231059 is a prime.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 837347 + ... + 837603.

It is an arithmetic number, because the mean of its divisors is an integer number (11290510).

Almost surely, 2^215231075 is an apocalyptic number.

215231075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

215231075 is a deficient number, since it is larger than the sum of its proper divisors (55741165).

215231075 is a wasteful number, since it uses less digits than its factorization.

215231075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647 (or 642 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 215231075 is about 14670.7557746696. The cubic root of 215231075 is about 599.2871859029.

Adding to 215231075 its reverse (570132512), we get a palindrome (785363587).

The spelling of 215231075 in words is "two hundred fifteen million, two hundred thirty-one thousand, seventy-five".