231653 has 4 divisors (see below), whose sum is σ = 234528. Its totient is φ = 228780.

The previous prime is 231643. The next prime is 231661. The reversal of 231653 is 356132.

231653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 231653 - 2⁶ = 231589 is a prime.

It is a super-2 number, since 2×231653² = 107326224818, 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 (231613) 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, 1313 + ... + 1478.

It is an arithmetic number, because the mean of its divisors is an integer number (58632).

2²³¹⁶⁵³ is an apocalyptic number.

It is an amenable number.

231653 is a deficient number, since it is larger than the sum of its proper divisors (2875).

231653 is an equidigital number, since it uses as much as digits as its factorization.

231653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2874.

The product of its digits is 540, while the sum is 20.

The square root of 231653 is about 481.3034385915. The cubic root of 231653 is about 61.4156863443.

Adding to 231653 its reverse (356132), we get a palindrome (587785).

The spelling of 231653 in words is "two hundred thirty-one thousand, six hundred fifty-three".