215601441 has 16 divisors (see below), whose sum is σ = 320897280. Its totient is φ = 127627920.

The previous prime is 215601431. The next prime is 215601467. The reversal of 215601441 is 144106512.

It is a happy number.

It is not a de Polignac number, because 215601441 - 2⁵ = 215601409 is a prime.

It is a super-2 number, since 2×215601441² = 92967962722552962, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215601431) 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 15 ways as a sum of consecutive naturals, for example, 74551 + ... + 77388.

It is an arithmetic number, because the mean of its divisors is an integer number (20056080).

Almost surely, 2^215601441 is an apocalyptic number.

It is an amenable number.

215601441 is a deficient number, since it is larger than the sum of its proper divisors (105295839).

215601441 is a wasteful number, since it uses less digits than its factorization.

215601441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151996.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 215601441 is about 14683.3729435712. The cubic root of 215601441 is about 599.6307366765.

Adding to 215601441 its reverse (144106512), we get a palindrome (359707953).

The spelling of 215601441 in words is "two hundred fifteen million, six hundred one thousand, four hundred forty-one".