215243401 has 2 divisors, whose sum is σ = 215243402. Its totient is φ = 215243400.

The previous prime is 215243377. The next prime is 215243429. The reversal of 215243401 is 104342512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214476025 + 767376 = 14645^2 + 876^2 .

It is a cyclic number.

It is not a de Polignac number, because 215243401 - 2¹¹ = 215241353 is a prime.

It is not a weakly prime, because it can be changed into another prime (215243491) 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, 107621700 + 107621701.

It is an arithmetic number, because the mean of its divisors is an integer number (107621701).

Almost surely, 2^215243401 is an apocalyptic number.

It is an amenable number.

215243401 is a deficient number, since it is larger than the sum of its proper divisors (1).

215243401 is an equidigital number, since it uses as much as digits as its factorization.

215243401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 215243401 is about 14671.1758560792. The cubic root of 215243401 is about 599.2986258136.

Adding to 215243401 its reverse (104342512), we get a palindrome (319585913).

The spelling of 215243401 in words is "two hundred fifteen million, two hundred forty-three thousand, four hundred one".