215165441 has 2 divisors, whose sum is σ = 215165442. Its totient is φ = 215165440.

The previous prime is 215165399. The next prime is 215165449. The reversal of 215165441 is 144561512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145926400 + 69239041 = 12080^2 + 8321^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215165441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (215165449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107582720 + 107582721.

It is an arithmetic number, because the mean of its divisors is an integer number (107582721).

Almost surely, 2^215165441 is an apocalyptic number.

It is an amenable number.

215165441 is a deficient number, since it is larger than the sum of its proper divisors (1).

215165441 is an equidigital number, since it uses as much as digits as its factorization.

215165441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 29.

The square root of 215165441 is about 14668.5187050363. The cubic root of 215165441 is about 599.2262628321.

The spelling of 215165441 in words is "two hundred fifteen million, one hundred sixty-five thousand, four hundred forty-one".