213686449 has 2 divisors, whose sum is σ = 213686450. Its totient is φ = 213686448.

The previous prime is 213686443. The next prime is 213686453. The reversal of 213686449 is 944686312.

It is a happy number.

213686449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198810000 + 14876449 = 14100^2 + 3857^2 .

It is a cyclic number.

It is not a de Polignac number, because 213686449 - 2¹⁹ = 213162161 is a prime.

It is not a weakly prime, because it can be changed into another prime (213686443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106843224 + 106843225.

It is an arithmetic number, because the mean of its divisors is an integer number (106843225).

Almost surely, 2^213686449 is an apocalyptic number.

It is an amenable number.

213686449 is a deficient number, since it is larger than the sum of its proper divisors (1).

213686449 is an equidigital number, since it uses as much as digits as its factorization.

213686449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 43.

The square root of 213686449 is about 14618.0179573019. The cubic root of 213686449 is about 597.8501291073.

The spelling of 213686449 in words is "two hundred thirteen million, six hundred eighty-six thousand, four hundred forty-nine".