229158721 has 8 divisors (see below), whose sum is σ = 250106688. Its totient is φ = 208230000.

The previous prime is 229158703. The next prime is 229158737. The reversal of 229158721 is 127851922.

229158721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 229158721 - 2¹¹ = 229156673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (229158751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33156 + ... + 39466.

It is an arithmetic number, because the mean of its divisors is an integer number (31263336).

Almost surely, 2^229158721 is an apocalyptic number.

It is an amenable number.

229158721 is a deficient number, since it is larger than the sum of its proper divisors (20947967).

229158721 is a wasteful number, since it uses less digits than its factorization.

229158721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9623.

The product of its digits is 20160, while the sum is 37.

The square root of 229158721 is about 15137.9893314799. The cubic root of 229158721 is about 611.9446325592.

The spelling of 229158721 in words is "two hundred twenty-nine million, one hundred fifty-eight thousand, seven hundred twenty-one".