213438737 has 2 divisors, whose sum is σ = 213438738. Its totient is φ = 213438736.

The previous prime is 213438683. The next prime is 213438779. The reversal of 213438737 is 737834312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210801361 + 2637376 = 14519^2 + 1624^2 .

It is a cyclic number.

It is not a de Polignac number, because 213438737 - 2⁸ = 213438481 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213438737.

It is not a weakly prime, because it can be changed into another prime (213438037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106719368 + 106719369.

It is an arithmetic number, because the mean of its divisors is an integer number (106719369).

Almost surely, 2^213438737 is an apocalyptic number.

It is an amenable number.

213438737 is a deficient number, since it is larger than the sum of its proper divisors (1).

213438737 is an equidigital number, since it uses as much as digits as its factorization.

213438737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 38.

The square root of 213438737 is about 14609.5426690913. The cubic root of 213438737 is about 597.6190242742.

The spelling of 213438737 in words is "two hundred thirteen million, four hundred thirty-eight thousand, seven hundred thirty-seven".