229355991 has 12 divisors (see below), whose sum is σ = 332088120. Its totient is φ = 152536560.

The previous prime is 229355981. The next prime is 229356013. The reversal of 229355991 is 199553922.

229355991 is a `hidden beast` number, since 2 + 2 + 9 + 3 + 559 + 91 = 666.

It is not a de Polignac number, because 229355991 - 2¹⁵ = 229323223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229355921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26640 + ... + 34181.

It is an arithmetic number, because the mean of its divisors is an integer number (27674010).

Almost surely, 2^229355991 is an apocalyptic number.

229355991 is a deficient number, since it is larger than the sum of its proper divisors (102732129).

229355991 is a wasteful number, since it uses less digits than its factorization.

229355991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61246 (or 61243 counting only the distinct ones).

The product of its digits is 218700, while the sum is 45.

The square root of 229355991 is about 15144.5036564425. The cubic root of 229355991 is about 612.1201785648.

The spelling of 229355991 in words is "two hundred twenty-nine million, three hundred fifty-five thousand, nine hundred ninety-one".