213438917 has 2 divisors, whose sum is σ = 213438918. Its totient is φ = 213438916.

The previous prime is 213438877. The next prime is 213438941. The reversal of 213438917 is 719834312.

213438917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154977601 + 58461316 = 12449^2 + 7646^2 .

It is a cyclic number.

It is not a de Polignac number, because 213438917 - 2¹⁰ = 213437893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213438217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106719458 + 106719459.

It is an arithmetic number, because the mean of its divisors is an integer number (106719459).

Almost surely, 2^213438917 is an apocalyptic number.

It is an amenable number.

213438917 is a deficient number, since it is larger than the sum of its proper divisors (1).

213438917 is an equidigital number, since it uses as much as digits as its factorization.

213438917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 213438917 is about 14609.5488294471. The cubic root of 213438917 is about 597.6191922715.

The spelling of 213438917 in words is "two hundred thirteen million, four hundred thirty-eight thousand, nine hundred seventeen".