123641653 has 4 divisors (see below), whose sum is σ = 123664428. Its totient is φ = 123618880.

The previous prime is 123641647. The next prime is 123641657. The reversal of 123641653 is 356146321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 356146321 = 31 ⋅11488591.

It can be written as a sum of positive squares in 2 ways, for example, as 35319249 + 88322404 = 5943^2 + 9398^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123641653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123641657) 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, 2013 + ... + 15853.

It is an arithmetic number, because the mean of its divisors is an integer number (30916107).

Almost surely, 2^123641653 is an apocalyptic number.

It is an amenable number.

123641653 is a deficient number, since it is larger than the sum of its proper divisors (22775).

123641653 is an equidigital number, since it uses as much as digits as its factorization.

123641653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22774.

The product of its digits is 12960, while the sum is 31.

The square root of 123641653 is about 11119.4268287534. The cubic root of 123641653 is about 498.1822703929.

Adding to 123641653 its reverse (356146321), we get a palindrome (479787974).

The spelling of 123641653 in words is "one hundred twenty-three million, six hundred forty-one thousand, six hundred fifty-three".