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231357 = 3723479
BaseRepresentation
bin111000011110111101
3102202100210
4320132331
524400412
64543033
71652340
oct703675
9382323
10231357
11148905
12b1a79
13813c9
1460457
154883c
hex387bd

231357 has 16 divisors (see below), whose sum is σ = 368640. Its totient is φ = 126192.

The previous prime is 231349. The next prime is 231359. The reversal of 231357 is 753132.

It is a happy number.

231357 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231357 - 23 = 231349 is a prime.

It is a super-2 number, since 2×2313572 = 107052122898, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

231357 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244 + ... + 722.

It is an arithmetic number, because the mean of its divisors is an integer number (23040).

2231357 is an apocalyptic number.

It is an amenable number.

231357 is a deficient number, since it is larger than the sum of its proper divisors (137283).

231357 is a wasteful number, since it uses less digits than its factorization.

231357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512.

The product of its digits is 630, while the sum is 21.

The square root of 231357 is about 480.9958419779. The cubic root of 231357 is about 61.3895167551.

Adding to 231357 its reverse (753132), we get a palindrome (984489).

It can be divided in two parts, 2313 and 57, that multiplied together give a triangular number (131841 = T513).

The spelling of 231357 in words is "two hundred thirty-one thousand, three hundred fifty-seven".

Divisors: 1 3 7 21 23 69 161 479 483 1437 3353 10059 11017 33051 77119 231357