215424401 has 2 divisors, whose sum is σ = 215424402. Its totient is φ = 215424400.

The previous prime is 215424361. The next prime is 215424409. The reversal of 215424401 is 104424512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203034001 + 12390400 = 14249^2 + 3520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215424401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (215424409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107712200 + 107712201.

It is an arithmetic number, because the mean of its divisors is an integer number (107712201).

Almost surely, 2^215424401 is an apocalyptic number.

It is an amenable number.

215424401 is a deficient number, since it is larger than the sum of its proper divisors (1).

215424401 is an equidigital number, since it uses as much as digits as its factorization.

215424401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 215424401 is about 14677.3431178807. The cubic root of 215424401 is about 599.4665638466.

Adding to 215424401 its reverse (104424512), we get a palindrome (319848913).

The spelling of 215424401 in words is "two hundred fifteen million, four hundred twenty-four thousand, four hundred one".