229947521 has 4 divisors (see below), whose sum is σ = 232318212. Its totient is φ = 227576832.

The previous prime is 229947511. The next prime is 229947527. The reversal of 229947521 is 125749922.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103632400 + 126315121 = 10180^2 + 11239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-229947521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (229947527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1185200 + ... + 1185393.

It is an arithmetic number, because the mean of its divisors is an integer number (58079553).

Almost surely, 2^229947521 is an apocalyptic number.

It is an amenable number.

229947521 is a deficient number, since it is larger than the sum of its proper divisors (2370691).

229947521 is an equidigital number, since it uses as much as digits as its factorization.

229947521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2370690.

The product of its digits is 90720, while the sum is 41.

The square root of 229947521 is about 15164.0206080050. The cubic root of 229947521 is about 612.6459647126.

The spelling of 229947521 in words is "two hundred twenty-nine million, nine hundred forty-seven thousand, five hundred twenty-one".