229206991 has 4 divisors (see below), whose sum is σ = 246838312. Its totient is φ = 211575672.

The previous prime is 229206961. The next prime is 229207001. The reversal of 229206991 is 199602922.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199602922 = 2 ⋅99801461.

It is a cyclic number.

It is not a de Polignac number, because 229206991 - 2⁵ = 229206959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229206911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8815641 + ... + 8815666.

It is an arithmetic number, because the mean of its divisors is an integer number (61709578).

Almost surely, 2^229206991 is an apocalyptic number.

229206991 is a deficient number, since it is larger than the sum of its proper divisors (17631321).

229206991 is a wasteful number, since it uses less digits than its factorization.

229206991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17631320.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 229206991 is about 15139.5835807990. The cubic root of 229206991 is about 611.9875962215.

The spelling of 229206991 in words is "two hundred twenty-nine million, two hundred six thousand, nine hundred ninety-one".