215240441 has 4 divisors (see below), whose sum is σ = 231797412. Its totient is φ = 198683472.

The previous prime is 215240429. The next prime is 215240449. The reversal of 215240441 is 144042512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 148328041 + 66912400 = 12179^2 + 8180^2 .

It is a de Polignac number, because none of the positive numbers 2^k-215240441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215240449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8278466 + ... + 8278491.

It is an arithmetic number, because the mean of its divisors is an integer number (57949353).

Almost surely, 2^215240441 is an apocalyptic number.

It is an amenable number.

215240441 is a deficient number, since it is larger than the sum of its proper divisors (16556971).

215240441 is a wasteful number, since it uses less digits than its factorization.

215240441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16556970.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 215240441 is about 14671.0749776559. The cubic root of 215240441 is about 599.2958786414.

Adding to 215240441 its reverse (144042512), we get a palindrome (359282953).

The spelling of 215240441 in words is "two hundred fifteen million, two hundred forty thousand, four hundred forty-one".