215164241 has 4 divisors (see below), whose sum is σ = 224519232. Its totient is φ = 205809252.

The previous prime is 215164237. The next prime is 215164249. The reversal of 215164241 is 142461512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 215164241 - 2² = 215164237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215164241.

It is not an unprimeable number, because it can be changed into a prime (215164249) 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 3 ways as a sum of consecutive naturals, for example, 4677461 + ... + 4677506.

It is an arithmetic number, because the mean of its divisors is an integer number (56129808).

Almost surely, 2^215164241 is an apocalyptic number.

It is an amenable number.

215164241 is a deficient number, since it is larger than the sum of its proper divisors (9354991).

215164241 is an equidigital number, since it uses as much as digits as its factorization.

215164241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9354990.

The product of its digits is 1920, while the sum is 26.

The square root of 215164241 is about 14668.4778010535. The cubic root of 215164241 is about 599.2251488476.

The spelling of 215164241 in words is "two hundred fifteen million, one hundred sixty-four thousand, two hundred forty-one".