215541441 has 24 divisors (see below), whose sum is σ = 326364480. Its totient is φ = 136816416.

The previous prime is 215541437. The next prime is 215541449. The reversal of 215541441 is 144145512.

215541441 is a `hidden beast` number, since 215 + 5 + 4 + 1 + 441 = 666.

215541441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215541441 - 2² = 215541437 is a prime.

It is a super-2 number, since 2×215541441² = 92916225576712962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215541449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45130 + ... + 49676.

It is an arithmetic number, because the mean of its divisors is an integer number (13598520).

Almost surely, 2^215541441 is an apocalyptic number.

It is an amenable number.

215541441 is a deficient number, since it is larger than the sum of its proper divisors (110823039).

215541441 is a wasteful number, since it uses less digits than its factorization.

215541441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4805 (or 4802 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 215541441 is about 14681.3296741133. The cubic root of 215541441 is about 599.5751075150.

Adding to 215541441 its reverse (144145512), we get a palindrome (359686953).

The spelling of 215541441 in words is "two hundred fifteen million, five hundred forty-one thousand, four hundred forty-one".