213638471 has 2 divisors, whose sum is σ = 213638472. Its totient is φ = 213638470.

The previous prime is 213638459. The next prime is 213638479. The reversal of 213638471 is 174836312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213638471 is a prime.

It is a super-3 number, since 3×213638471³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213638479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106819235 + 106819236.

It is an arithmetic number, because the mean of its divisors is an integer number (106819236).

Almost surely, 2^213638471 is an apocalyptic number.

213638471 is a deficient number, since it is larger than the sum of its proper divisors (1).

213638471 is an equidigital number, since it uses as much as digits as its factorization.

213638471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 213638471 is about 14616.3768082244. The cubic root of 213638471 is about 597.8053816114.

The spelling of 213638471 in words is "two hundred thirteen million, six hundred thirty-eight thousand, four hundred seventy-one".