215203261 has 24 divisors (see below), whose sum is σ = 271380480. Its totient is φ = 166180896.

The previous prime is 215203259. The next prime is 215203279. The reversal of 215203261 is 162302512.

It is not a de Polignac number, because 215203261 - 2¹ = 215203259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215203061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 167620 + ... + 168898.

It is an arithmetic number, because the mean of its divisors is an integer number (11307520).

Almost surely, 2^215203261 is an apocalyptic number.

It is an amenable number.

215203261 is a deficient number, since it is larger than the sum of its proper divisors (56177219).

215203261 is a wasteful number, since it uses less digits than its factorization.

215203261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385 (or 1342 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 215203261 is about 14669.8078037853. The cubic root of 215203261 is about 599.2613697858.

Adding to 215203261 its reverse (162302512), we get a palindrome (377505773).

The spelling of 215203261 in words is "two hundred fifteen million, two hundred three thousand, two hundred sixty-one".