213230261 has 2 divisors, whose sum is σ = 213230262. Its totient is φ = 213230260.

The previous prime is 213230219. The next prime is 213230267. The reversal of 213230261 is 162032312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169260100 + 43970161 = 13010^2 + 6631^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213230261 is a prime.

It is a super-2 number, since 2×213230261² = 90934288412256242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213230267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106615130 + 106615131.

It is an arithmetic number, because the mean of its divisors is an integer number (106615131).

Almost surely, 2^213230261 is an apocalyptic number.

It is an amenable number.

213230261 is a deficient number, since it is larger than the sum of its proper divisors (1).

213230261 is an equidigital number, since it uses as much as digits as its factorization.

213230261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 213230261 is about 14602.4060003823. The cubic root of 213230261 is about 597.4243863629.

Adding to 213230261 its reverse (162032312), we get a palindrome (375262573).

The spelling of 213230261 in words is "two hundred thirteen million, two hundred thirty thousand, two hundred sixty-one".