123730661 has 4 divisors (see below), whose sum is σ = 126748524. Its totient is φ = 120712800.

The previous prime is 123730657. The next prime is 123730667. The reversal of 123730661 is 166037321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166037321 = 193 ⋅860297.

It can be written as a sum of positive squares in 2 ways, for example, as 29757025 + 93973636 = 5455^2 + 9694^2 .

It is a cyclic number.

It is not a de Polignac number, because 123730661 - 2² = 123730657 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 (123730667) 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, 1508870 + ... + 1508951.

It is an arithmetic number, because the mean of its divisors is an integer number (31687131).

Almost surely, 2^123730661 is an apocalyptic number.

It is an amenable number.

123730661 is a deficient number, since it is larger than the sum of its proper divisors (3017863).

123730661 is an equidigital number, since it uses as much as digits as its factorization.

123730661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3017862.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 123730661 is about 11123.4284732721. The cubic root of 123730661 is about 498.3017866730.

Adding to 123730661 its reverse (166037321), we get a palindrome (289767982).

The spelling of 123730661 in words is "one hundred twenty-three million, seven hundred thirty thousand, six hundred sixty-one".