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231213 = 3372083
BaseRepresentation
bin111000011100101101
3102202011110
4320130231
524344323
64542233
71652043
oct703455
9382143
10231213
11148794
12b1979
1381318
1460393
1548793
hex3872d

231213 has 8 divisors (see below), whose sum is σ = 316768. Its totient is φ = 149904.

The previous prime is 231197. The next prime is 231223. The reversal of 231213 is 312132.

It is a happy number.

231213 is nontrivially palindromic in base 13.

231213 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 231213 - 24 = 231197 is a prime.

It is a Duffinian number.

231213 is strictly pandigital in base 7.

231213 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231223) 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, 931 + ... + 1152.

It is an arithmetic number, because the mean of its divisors is an integer number (39596).

2231213 is an apocalyptic number.

It is an amenable number.

231213 is a deficient number, since it is larger than the sum of its proper divisors (85555).

231213 is a wasteful number, since it uses less digits than its factorization.

231213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2123.

The product of its digits is 36, while the sum is 12.

The square root of 231213 is about 480.8461292347. The cubic root of 231213 is about 61.3767775323.

Adding to 231213 its reverse (312132), we get a palindrome (543345).

It can be divided in two parts, 231 and 213, that added together give a palindrome (444).

The spelling of 231213 in words is "two hundred thirty-one thousand, two hundred thirteen".

Divisors: 1 3 37 111 2083 6249 77071 231213