213539769 has 9 divisors (see below), whose sum is σ = 308509669. Its totient is φ = 142330620.

The previous prime is 213539761. The next prime is 213539773. The reversal of 213539769 is 967935312.

The square root of 213539769 is 14613.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 213539769 - 2³ = 213539761 is a prime.

It is a super-2 number, since 2×213539769² = 91198465889146722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (213539761) 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 in 8 ways as a sum of consecutive naturals, for example, 41404 + ... + 46274.

Almost surely, 2^213539769 is an apocalyptic number.

213539769 is the 14613-rd square number.

213539769 is the 7307-th centered octagonal number.

It is an amenable number.

213539769 is a deficient number, since it is larger than the sum of its proper divisors (94969900).

213539769 is an frugal number, since it uses more digits than its factorization.

213539769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9748 (or 4874 counting only the distinct ones).

The product of its digits is 306180, while the sum is 45.

The cubic root of 213539769 is about 597.7133044438.

The spelling of 213539769 in words is "two hundred thirteen million, five hundred thirty-nine thousand, seven hundred sixty-nine".