213857647 has 2 divisors, whose sum is σ = 213857648. Its totient is φ = 213857646.

The previous prime is 213857641. The next prime is 213857653. The reversal of 213857647 is 746758312.

It is a balanced prime because it is at equal distance from previous prime (213857641) and next prime (213857653).

It is a cyclic number.

It is not a de Polignac number, because 213857647 - 2²³ = 205469039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213857641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106928823 + 106928824.

It is an arithmetic number, because the mean of its divisors is an integer number (106928824).

Almost surely, 2^213857647 is an apocalyptic number.

213857647 is a deficient number, since it is larger than the sum of its proper divisors (1).

213857647 is an equidigital number, since it uses as much as digits as its factorization.

213857647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 43.

The square root of 213857647 is about 14623.8725035471. The cubic root of 213857647 is about 598.0097452579.

The spelling of 213857647 in words is "two hundred thirteen million, eight hundred fifty-seven thousand, six hundred forty-seven".