213749647 has 2 divisors, whose sum is σ = 213749648. Its totient is φ = 213749646.

The previous prime is 213749581. The next prime is 213749659. The reversal of 213749647 is 746947312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213749647 - 2⁷ = 213749519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213749047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106874823 + 106874824.

It is an arithmetic number, because the mean of its divisors is an integer number (106874824).

Almost surely, 2^213749647 is an apocalyptic number.

213749647 is a deficient number, since it is larger than the sum of its proper divisors (1).

213749647 is an equidigital number, since it uses as much as digits as its factorization.

213749647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 43.

The square root of 213749647 is about 14620.1794448632. The cubic root of 213749647 is about 597.9090615734.

The spelling of 213749647 in words is "two hundred thirteen million, seven hundred forty-nine thousand, six hundred forty-seven".