229861993 has 4 divisors (see below), whose sum is σ = 237276928. Its totient is φ = 222447060.

The previous prime is 229861987. The next prime is 229861997. The reversal of 229861993 is 399168922.

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, and also an emirpimes, since its reverse is a distinct semiprime: 399168922 = 2 ⋅199584461.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-229861993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (229861997) 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, 3707421 + ... + 3707482.

It is an arithmetic number, because the mean of its divisors is an integer number (59319232).

Almost surely, 2^229861993 is an apocalyptic number.

It is an amenable number.

229861993 is a deficient number, since it is larger than the sum of its proper divisors (7414935).

229861993 is an equidigital number, since it uses as much as digits as its factorization.

229861993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7414934.

The product of its digits is 419904, while the sum is 49.

The square root of 229861993 is about 15161.2002493206. The cubic root of 229861993 is about 612.5699982753.

The spelling of 229861993 in words is "two hundred twenty-nine million, eight hundred sixty-one thousand, nine hundred ninety-three".