213668669 has 2 divisors, whose sum is σ = 213668670. Its totient is φ = 213668668.

The previous prime is 213668657. The next prime is 213668687. The reversal of 213668669 is 966866312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179211769 + 34456900 = 13387^2 + 5870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213668669 is a prime.

It is a super-2 number, since 2×213668669² = 91308600224463122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213668269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106834334 + 106834335.

It is an arithmetic number, because the mean of its divisors is an integer number (106834335).

Almost surely, 2^213668669 is an apocalyptic number.

It is an amenable number.

213668669 is a deficient number, since it is larger than the sum of its proper divisors (1).

213668669 is an equidigital number, since it uses as much as digits as its factorization.

213668669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 47.

The square root of 213668669 is about 14617.4097910676. The cubic root of 213668669 is about 597.8335470698.

The spelling of 213668669 in words is "two hundred thirteen million, six hundred sixty-eight thousand, six hundred sixty-nine".