215240329 has 2 divisors, whose sum is σ = 215240330. Its totient is φ = 215240328.

The previous prime is 215240323. The next prime is 215240351. The reversal of 215240329 is 923042512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170041600 + 45198729 = 13040^2 + 6723^2 .

It is a cyclic number.

It is not a de Polignac number, because 215240329 - 2⁵ = 215240297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215240297 and 215240306.

It is not a weakly prime, because it can be changed into another prime (215240323) 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 as a sum of consecutive naturals, namely, 107620164 + 107620165.

It is an arithmetic number, because the mean of its divisors is an integer number (107620165).

Almost surely, 2^215240329 is an apocalyptic number.

It is an amenable number.

215240329 is a deficient number, since it is larger than the sum of its proper divisors (1).

215240329 is an equidigital number, since it uses as much as digits as its factorization.

215240329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 215240329 is about 14671.0711606208. The cubic root of 215240329 is about 599.2957746938.

The spelling of 215240329 in words is "two hundred fifteen million, two hundred forty thousand, three hundred twenty-nine".