229021091 has 16 divisors (see below), whose sum is σ = 255816960. Its totient is φ = 203575680.

The previous prime is 229021073. The next prime is 229021103. The reversal of 229021091 is 190120922.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 229021091 - 2¹⁰ = 229020067 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 229021091.

It is not an unprimeable number, because it can be changed into a prime (229021021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 230606 + ... + 231596.

It is an arithmetic number, because the mean of its divisors is an integer number (15988560).

Almost surely, 2^229021091 is an apocalyptic number.

229021091 is a deficient number, since it is larger than the sum of its proper divisors (26795869).

229021091 is a wasteful number, since it uses less digits than its factorization.

229021091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 229021091 is about 15133.4428006320. The cubic root of 229021091 is about 611.8220991380.

Subtracting from 229021091 its reverse (190120922), we obtain a square (38900169 = 6237²).

The spelling of 229021091 in words is "two hundred twenty-nine million, twenty-one thousand, ninety-one".