213634789 has 2 divisors, whose sum is σ = 213634790. Its totient is φ = 213634788.

The previous prime is 213634777. The next prime is 213634807. The reversal of 213634789 is 987436312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209033764 + 4601025 = 14458^2 + 2145^2 .

It is a cyclic number.

It is not a de Polignac number, because 213634789 - 2¹⁵ = 213602021 is a prime.

It is a super-3 number, since 3×213634789³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213634709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106817394 + 106817395.

It is an arithmetic number, because the mean of its divisors is an integer number (106817395).

Almost surely, 2^213634789 is an apocalyptic number.

It is an amenable number.

213634789 is a deficient number, since it is larger than the sum of its proper divisors (1).

213634789 is an equidigital number, since it uses as much as digits as its factorization.

213634789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The square root of 213634789 is about 14616.2508530745. The cubic root of 213634789 is about 597.8019472548.

The spelling of 213634789 in words is "two hundred thirteen million, six hundred thirty-four thousand, seven hundred eighty-nine".