213259961 has 2 divisors, whose sum is σ = 213259962. Its totient is φ = 213259960.

The previous prime is 213259957. The next prime is 213259967. The reversal of 213259961 is 169952312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209815225 + 3444736 = 14485^2 + 1856^2 .

It is a cyclic number.

It is not a de Polignac number, because 213259961 - 2² = 213259957 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213259967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106629980 + 106629981.

It is an arithmetic number, because the mean of its divisors is an integer number (106629981).

Almost surely, 2^213259961 is an apocalyptic number.

It is an amenable number.

213259961 is a deficient number, since it is larger than the sum of its proper divisors (1).

213259961 is an equidigital number, since it uses as much as digits as its factorization.

213259961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 38.

The square root of 213259961 is about 14603.4229206717. The cubic root of 213259961 is about 597.4521227021.

The spelling of 213259961 in words is "two hundred thirteen million, two hundred fifty-nine thousand, nine hundred sixty-one".