123653 has 2 divisors, whose sum is σ = 123654. Its totient is φ = 123652.

The previous prime is 123637. The next prime is 123661. The reversal of 123653 is 356321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114244 + 9409 = 338^2 + 97^2 .

It is a cyclic number.

It is not a de Polignac number, because 123653 - 2⁴ = 123637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61826 + 61827.

It is an arithmetic number, because the mean of its divisors is an integer number (61827).

2¹²³⁶⁵³ is an apocalyptic number.

It is an amenable number.

123653 is a deficient number, since it is larger than the sum of its proper divisors (1).

123653 is an equidigital number, since it uses as much as digits as its factorization.

123653 is an evil number, because the sum of its binary digits is even.

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

The square root of 123653 is about 351.6432851627. The cubic root of 123653 is about 49.8197509867.

Adding to 123653 its reverse (356321), we get a palindrome (479974).

The spelling of 123653 in words is "one hundred twenty-three thousand, six hundred fifty-three".