213631729 has 2 divisors, whose sum is σ = 213631730. Its totient is φ = 213631728.

The previous prime is 213631727. The next prime is 213631753. The reversal of 213631729 is 927136312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200505600 + 13126129 = 14160^2 + 3623^2 .

It is a cyclic number.

It is not a de Polignac number, because 213631729 - 2¹ = 213631727 is a prime.

Together with 213631727, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 213631694 and 213631703.

It is not a weakly prime, because it can be changed into another prime (213631727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106815864 + 106815865.

It is an arithmetic number, because the mean of its divisors is an integer number (106815865).

Almost surely, 2^213631729 is an apocalyptic number.

It is an amenable number.

213631729 is a deficient number, since it is larger than the sum of its proper divisors (1).

213631729 is an equidigital number, since it uses as much as digits as its factorization.

213631729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 34.

The square root of 213631729 is about 14616.1461746932. The cubic root of 213631729 is about 597.7990930338.

The spelling of 213631729 in words is "two hundred thirteen million, six hundred thirty-one thousand, seven hundred twenty-nine".