213631349 has 2 divisors, whose sum is σ = 213631350. Its totient is φ = 213631348.

The previous prime is 213631343. The next prime is 213631351. The reversal of 213631349 is 943136312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213598225 + 33124 = 14615^2 + 182^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213631349 is a prime.

Together with 213631351, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213631343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106815674 + 106815675.

It is an arithmetic number, because the mean of its divisors is an integer number (106815675).

Almost surely, 2^213631349 is an apocalyptic number.

It is an amenable number.

213631349 is a deficient number, since it is larger than the sum of its proper divisors (1).

213631349 is an equidigital number, since it uses as much as digits as its factorization.

213631349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 32.

The square root of 213631349 is about 14616.1331753648. The cubic root of 213631349 is about 597.7987385862.

The spelling of 213631349 in words is "two hundred thirteen million, six hundred thirty-one thousand, three hundred forty-nine".