215431201 has 2 divisors, whose sum is σ = 215431202. Its totient is φ = 215431200.

The previous prime is 215431163. The next prime is 215431213. The reversal of 215431201 is 102134512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215384976 + 46225 = 14676^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 215431201 - 2⁹ = 215430689 is a prime.

It is not a weakly prime, because it can be changed into another prime (215431301) 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, 107715600 + 107715601.

It is an arithmetic number, because the mean of its divisors is an integer number (107715601).

Almost surely, 2^215431201 is an apocalyptic number.

It is an amenable number.

215431201 is a deficient number, since it is larger than the sum of its proper divisors (1).

215431201 is an equidigital number, since it uses as much as digits as its factorization.

215431201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 215431201 is about 14677.5747656076. The cubic root of 215431201 is about 599.4728712871.

Adding to 215431201 its reverse (102134512), we get a palindrome (317565713).

The spelling of 215431201 in words is "two hundred fifteen million, four hundred thirty-one thousand, two hundred one".