213728737 has 2 divisors, whose sum is σ = 213728738. Its totient is φ = 213728736.

The previous prime is 213728731. The next prime is 213728747. The reversal of 213728737 is 737827312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107308881 + 106419856 = 10359^2 + 10316^2 .

It is a cyclic number.

It is not a de Polignac number, because 213728737 - 2⁷ = 213728609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213728737.

It is not a weakly prime, because it can be changed into another prime (213728731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106864368 + 106864369.

It is an arithmetic number, because the mean of its divisors is an integer number (106864369).

Almost surely, 2^213728737 is an apocalyptic number.

It is an amenable number.

213728737 is a deficient number, since it is larger than the sum of its proper divisors (1).

213728737 is an equidigital number, since it uses as much as digits as its factorization.

213728737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98784, while the sum is 40.

The square root of 213728737 is about 14619.4643198716. The cubic root of 213728737 is about 597.8895641749.

The spelling of 213728737 in words is "two hundred thirteen million, seven hundred twenty-eight thousand, seven hundred thirty-seven".