215540323 has 2 divisors, whose sum is σ = 215540324. Its totient is φ = 215540322.

The previous prime is 215540317. The next prime is 215540327. The reversal of 215540323 is 323045512.

215540323 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215540323 - 2⁹ = 215539811 is a prime.

It is not a weakly prime, because it can be changed into another prime (215540327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107770161 + 107770162.

It is an arithmetic number, because the mean of its divisors is an integer number (107770162).

Almost surely, 2^215540323 is an apocalyptic number.

215540323 is a deficient number, since it is larger than the sum of its proper divisors (1).

215540323 is an equidigital number, since it uses as much as digits as its factorization.

215540323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 215540323 is about 14681.2915984936. The cubic root of 215540323 is about 599.5740708603.

Adding to 215540323 its reverse (323045512), we get a palindrome (538585835).

The spelling of 215540323 in words is "two hundred fifteen million, five hundred forty thousand, three hundred twenty-three".