213642641 has 2 divisors, whose sum is σ = 213642642. Its totient is φ = 213642640.

The previous prime is 213642601. The next prime is 213642661. The reversal of 213642641 is 146246312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178489600 + 35153041 = 13360^2 + 5929^2 .

It is a cyclic number.

It is not a de Polignac number, because 213642641 - 2⁶ = 213642577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213642601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106821320 + 106821321.

It is an arithmetic number, because the mean of its divisors is an integer number (106821321).

Almost surely, 2^213642641 is an apocalyptic number.

It is an amenable number.

213642641 is a deficient number, since it is larger than the sum of its proper divisors (1).

213642641 is an equidigital number, since it uses as much as digits as its factorization.

213642641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 29.

The square root of 213642641 is about 14616.5194557391. The cubic root of 213642641 is about 597.8092710985.

Adding to 213642641 its reverse (146246312), we get a palindrome (359888953).

The spelling of 213642641 in words is "two hundred thirteen million, six hundred forty-two thousand, six hundred forty-one".