213730669 has 2 divisors, whose sum is σ = 213730670. Its totient is φ = 213730668.

The previous prime is 213730591. The next prime is 213730679. The reversal of 213730669 is 966037312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159516900 + 54213769 = 12630^2 + 7363^2 .

It is a cyclic number.

It is not a de Polignac number, because 213730669 - 2⁷ = 213730541 is a prime.

It is a super-2 number, since 2×213730669² = 91361597742375122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213730679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106865334 + 106865335.

It is an arithmetic number, because the mean of its divisors is an integer number (106865335).

Almost surely, 2^213730669 is an apocalyptic number.

It is an amenable number.

213730669 is a deficient number, since it is larger than the sum of its proper divisors (1).

213730669 is an equidigital number, since it uses as much as digits as its factorization.

213730669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 213730669 is about 14619.5303960148. The cubic root of 213730669 is about 597.8913657095.

The spelling of 213730669 in words is "two hundred thirteen million, seven hundred thirty thousand, six hundred sixty-nine".