213260981 has 2 divisors, whose sum is σ = 213260982. Its totient is φ = 213260980.

The previous prime is 213260969. The next prime is 213261017. The reversal of 213260981 is 189062312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212722225 + 538756 = 14585^2 + 734^2 .

It is a cyclic number.

It is not a de Polignac number, because 213260981 - 2⁶ = 213260917 is a prime.

It is a super-2 number, since 2×213260981² = 90960492034164722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213260581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106630490 + 106630491.

It is an arithmetic number, because the mean of its divisors is an integer number (106630491).

Almost surely, 2^213260981 is an apocalyptic number.

It is an amenable number.

213260981 is a deficient number, since it is larger than the sum of its proper divisors (1).

213260981 is an equidigital number, since it uses as much as digits as its factorization.

213260981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 213260981 is about 14603.4578439492. The cubic root of 213260981 is about 597.4530752175.

The spelling of 213260981 in words is "two hundred thirteen million, two hundred sixty thousand, nine hundred eighty-one".