215623841 has 2 divisors, whose sum is σ = 215623842. Its totient is φ = 215623840.

The previous prime is 215623813. The next prime is 215623843. The reversal of 215623841 is 148326512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201214225 + 14409616 = 14185^2 + 3796^2 .

It is a cyclic number.

It is not a de Polignac number, because 215623841 - 2⁶ = 215623777 is a prime.

Together with 215623843, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 215623798 and 215623807.

It is not a weakly prime, because it can be changed into another prime (215623843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107811920 + 107811921.

It is an arithmetic number, because the mean of its divisors is an integer number (107811921).

Almost surely, 2^215623841 is an apocalyptic number.

It is an amenable number.

215623841 is a deficient number, since it is larger than the sum of its proper divisors (1).

215623841 is an equidigital number, since it uses as much as digits as its factorization.

215623841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

The square root of 215623841 is about 14684.1356912826. The cubic root of 215623841 is about 599.6515022510.

The spelling of 215623841 in words is "two hundred fifteen million, six hundred twenty-three thousand, eight hundred forty-one".