123555653 has 4 divisors (see below), whose sum is σ = 133059948. Its totient is φ = 114051360.

The previous prime is 123555647. The next prime is 123555659. The reversal of 123555653 is 356555321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 356555321 = 157 ⋅2271053.

It is an interprime number because it is at equal distance from previous prime (123555647) and next prime (123555659).

It can be written as a sum of positive squares in 2 ways, for example, as 11682724 + 111872929 = 3418^2 + 10577^2 .

It is a cyclic number.

It is not a de Polignac number, because 123555653 - 2¹² = 123551557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123555659) 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, 4752128 + ... + 4752153.

It is an arithmetic number, because the mean of its divisors is an integer number (33264987).

Almost surely, 2^123555653 is an apocalyptic number.

123555653 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

123555653 is a deficient number, since it is larger than the sum of its proper divisors (9504295).

123555653 is an equidigital number, since it uses as much as digits as its factorization.

123555653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9504294.

The product of its digits is 67500, while the sum is 35.

The square root of 123555653 is about 11115.5590502682. The cubic root of 123555653 is about 498.0667386351.

The spelling of 123555653 in words is "one hundred twenty-three million, five hundred fifty-five thousand, six hundred fifty-three".