229721779849 has 9 divisors (see below), whose sum is σ = 232704814797. Its totient is φ = 226776524364.

The previous prime is 229721779811. The next prime is 229721779871. The reversal of 229721779849 is 948977127922.

The square root of 229721779849 is 479293.

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

It is not a de Polignac number, because 229721779849 - 2²⁹ = 229184908937 is a prime.

It is a super-2 number, since 2×229721779849² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (229721779549) 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, 37861114 + ... + 37867180.

It is an arithmetic number, because the mean of its divisors is an integer number (25856090533).

Almost surely, 2^229721779849 is an apocalyptic number.

229721779849 is the 479293-rd square number.

229721779849 is the 239647-th centered octagonal number.

It is an amenable number.

229721779849 is a deficient number, since it is larger than the sum of its proper divisors (2983034948).

229721779849 is an frugal number, since it uses more digits than its factorization.

229721779849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12292 (or 6146 counting only the distinct ones).

The product of its digits is 64012032, while the sum is 67.

The spelling of 229721779849 in words is "two hundred twenty-nine billion, seven hundred twenty-one million, seven hundred seventy-nine thousand, eight hundred forty-nine".