213664739 has 2 divisors, whose sum is σ = 213664740. Its totient is φ = 213664738.

The previous prime is 213664697. The next prime is 213664753. The reversal of 213664739 is 937466312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213664739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213664696 and 213664705.

It is not a weakly prime, because it can be changed into another prime (213604739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106832369 + 106832370.

It is an arithmetic number, because the mean of its divisors is an integer number (106832370).

Almost surely, 2^213664739 is an apocalyptic number.

213664739 is a deficient number, since it is larger than the sum of its proper divisors (1).

213664739 is an equidigital number, since it uses as much as digits as its factorization.

213664739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 41.

The square root of 213664739 is about 14617.2753617081. The cubic root of 213664739 is about 597.8298817371.

The spelling of 213664739 in words is "two hundred thirteen million, six hundred sixty-four thousand, seven hundred thirty-nine".