213130261 has 2 divisors, whose sum is σ = 213130262. Its totient is φ = 213130260.

The previous prime is 213130237. The next prime is 213130303. The reversal of 213130261 is 162031312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140778225 + 72352036 = 11865^2 + 8506^2 .

It is a cyclic number.

It is not a de Polignac number, because 213130261 - 2¹⁹ = 212605973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213230261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106565130 + 106565131.

It is an arithmetic number, because the mean of its divisors is an integer number (106565131).

Almost surely, 2^213130261 is an apocalyptic number.

It is an amenable number.

213130261 is a deficient number, since it is larger than the sum of its proper divisors (1).

213130261 is an equidigital number, since it uses as much as digits as its factorization.

213130261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 213130261 is about 14598.9815055709. The cubic root of 213130261 is about 597.3309790763.

Adding to 213130261 its reverse (162031312), we get a palindrome (375161573).

The spelling of 213130261 in words is "two hundred thirteen million, one hundred thirty thousand, two hundred sixty-one".