213451649 has 2 divisors, whose sum is σ = 213451650. Its totient is φ = 213451648.

The previous prime is 213451621. The next prime is 213451657. The reversal of 213451649 is 946154312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119749249 + 93702400 = 10943^2 + 9680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213451649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213451669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106725824 + 106725825.

It is an arithmetic number, because the mean of its divisors is an integer number (106725825).

Almost surely, 2^213451649 is an apocalyptic number.

It is an amenable number.

213451649 is a deficient number, since it is larger than the sum of its proper divisors (1).

213451649 is an equidigital number, since it uses as much as digits as its factorization.

213451649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 213451649 is about 14609.9845653580. The cubic root of 213451649 is about 597.6310750408.

The spelling of 213451649 in words is "two hundred thirteen million, four hundred fifty-one thousand, six hundred forty-nine".