229731365809 has 9 divisors (see below), whose sum is σ = 252520437099. Its totient is φ = 208841903160.

The previous prime is 229731365783. The next prime is 229731365827. The reversal of 229731365809 is 908563137922.

The square root of 229731365809 is 479303.

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

It can be written as a sum of positive squares in only one way, i.e., 1274133025 + 228457232784 = 35695^2 + 477972^2 .

It is not a de Polignac number, because 229731365809 - 2¹³ = 229731357617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 229731365809.

It is not an unprimeable number, because it can be changed into a prime (229731365839) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5250547 + ... + 5294119.

Almost surely, 2^229731365809 is an apocalyptic number.

229731365809 is the 479303-rd square number.

229731365809 is the 239652-nd centered octagonal number.

It is an amenable number.

229731365809 is a deficient number, since it is larger than the sum of its proper divisors (22789071290).

229731365809 is an frugal number, since it uses more digits than its factorization.

229731365809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87168 (or 43584 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 229731365809 in words is "two hundred twenty-nine billion, seven hundred thirty-one million, three hundred sixty-five thousand, eight hundred nine".