229535981 has 4 divisors (see below), whose sum is σ = 229594464. Its totient is φ = 229477500.

The previous prime is 229535959. The next prime is 229535987. The reversal of 229535981 is 189535922.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-229535981 is a prime.

It is a super-2 number, since 2×229535981² = 105373533147264722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229535987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22895 + ... + 31356.

It is an arithmetic number, because the mean of its divisors is an integer number (57398616).

Almost surely, 2^229535981 is an apocalyptic number.

It is an amenable number.

229535981 is a deficient number, since it is larger than the sum of its proper divisors (58483).

229535981 is an equidigital number, since it uses as much as digits as its factorization.

229535981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58482.

The product of its digits is 194400, while the sum is 44.

The square root of 229535981 is about 15150.4449109589. Note that the first 3 decimals coincide. The cubic root of 229535981 is about 612.2802597011.

The spelling of 229535981 in words is "two hundred twenty-nine million, five hundred thirty-five thousand, nine hundred eighty-one".