231220113 has 8 divisors (see below), whose sum is σ = 309617568. Its totient is φ = 153484704.

The previous prime is 231220097. The next prime is 231220153. The reversal of 231220113 is 311022132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231220113 - 2⁴ = 231220097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231220092 and 231220101.

It is not an unprimeable number, because it can be changed into a prime (231220153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164695 + ... + 166092.

It is an arithmetic number, because the mean of its divisors is an integer number (38702196).

Almost surely, 2^231220113 is an apocalyptic number.

It is an amenable number.

231220113 is a deficient number, since it is larger than the sum of its proper divisors (78397455).

231220113 is a wasteful number, since it uses less digits than its factorization.

231220113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331023.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 231220113 is about 15205.9236154862. The cubic root of 231220113 is about 613.7740692095.

Adding to 231220113 its reverse (311022132), we get a palindrome (542242245).

The spelling of 231220113 in words is "two hundred thirty-one million, two hundred twenty thousand, one hundred thirteen".