215500441 has 8 divisors (see below), whose sum is σ = 232274504. Its totient is φ = 198754560.

The previous prime is 215500429. The next prime is 215500471. The reversal of 215500441 is 144005512.

It can be written as a sum of positive squares in 4 ways, for example, as 86564416 + 128936025 = 9304^2 + 11355^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215500441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215500471) 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 7 ways as a sum of consecutive naturals, for example, 10471 + ... + 23251.

It is an arithmetic number, because the mean of its divisors is an integer number (29034313).

Almost surely, 2^215500441 is an apocalyptic number.

It is an amenable number.

215500441 is a deficient number, since it is larger than the sum of its proper divisors (16774063).

215500441 is a wasteful number, since it uses less digits than its factorization.

215500441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14091.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 215500441 is about 14679.9332764151. The cubic root of 215500441 is about 599.5370883168.

Adding to 215500441 its reverse (144005512), we get a palindrome (359505953).

The spelling of 215500441 in words is "two hundred fifteen million, five hundred thousand, four hundred forty-one".