213786889 has 2 divisors, whose sum is σ = 213786890. Its totient is φ = 213786888.

The previous prime is 213786871. The next prime is 213786919. The reversal of 213786889 is 988687312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145443600 + 68343289 = 12060^2 + 8267^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213786889 is a prime.

It is not a weakly prime, because it can be changed into another prime (213786809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106893444 + 106893445.

It is an arithmetic number, because the mean of its divisors is an integer number (106893445).

Almost surely, 2^213786889 is an apocalyptic number.

It is an amenable number.

213786889 is a deficient number, since it is larger than the sum of its proper divisors (1).

213786889 is an equidigital number, since it uses as much as digits as its factorization.

213786889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 52.

The square root of 213786889 is about 14621.4530399684. The cubic root of 213786889 is about 597.9437844942.

The spelling of 213786889 in words is "two hundred thirteen million, seven hundred eighty-six thousand, eight hundred eighty-nine".