213289961 has 2 divisors, whose sum is σ = 213289962. Its totient is φ = 213289960.

The previous prime is 213289949. The next prime is 213289987. The reversal of 213289961 is 169982312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207907561 + 5382400 = 14419^2 + 2320^2 .

It is a cyclic number.

It is not a de Polignac number, because 213289961 - 2¹⁰ = 213288937 is a prime.

It is not a weakly prime, because it can be changed into another prime (213289931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106644980 + 106644981.

It is an arithmetic number, because the mean of its divisors is an integer number (106644981).

Almost surely, 2^213289961 is an apocalyptic number.

It is an amenable number.

213289961 is a deficient number, since it is larger than the sum of its proper divisors (1).

213289961 is an equidigital number, since it uses as much as digits as its factorization.

213289961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 213289961 is about 14604.4500409978. The cubic root of 213289961 is about 597.4801365922.

The spelling of 213289961 in words is "two hundred thirteen million, two hundred eighty-nine thousand, nine hundred sixty-one".