213612401 has 2 divisors, whose sum is σ = 213612402. Its totient is φ = 213612400.

The previous prime is 213612397. The next prime is 213612403. The reversal of 213612401 is 104216312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194463025 + 19149376 = 13945^2 + 4376^2 .

It is a cyclic number.

It is not a de Polignac number, because 213612401 - 2² = 213612397 is a prime.

It is a Sophie Germain prime.

Together with 213612403, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (213612403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106806200 + 106806201.

It is an arithmetic number, because the mean of its divisors is an integer number (106806201).

Almost surely, 2^213612401 is an apocalyptic number.

It is an amenable number.

213612401 is a deficient number, since it is larger than the sum of its proper divisors (1).

213612401 is an equidigital number, since it uses as much as digits as its factorization.

213612401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 213612401 is about 14615.4849731372. The cubic root of 213612401 is about 597.7810641742.

Adding to 213612401 its reverse (104216312), we get a palindrome (317828713).

The spelling of 213612401 in words is "two hundred thirteen million, six hundred twelve thousand, four hundred one".