123985761 has 4 divisors (see below), whose sum is σ = 165314352. Its totient is φ = 82657172.

The previous prime is 123985751. The next prime is 123985769. The reversal of 123985761 is 167589321.

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 123985761 - 2¹⁰ = 123984737 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123985769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20664291 + ... + 20664296.

It is an arithmetic number, because the mean of its divisors is an integer number (41328588).

Almost surely, 2^123985761 is an apocalyptic number.

It is an amenable number.

123985761 is a deficient number, since it is larger than the sum of its proper divisors (41328591).

123985761 is an equidigital number, since it uses as much as digits as its factorization.

123985761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41328590.

The product of its digits is 90720, while the sum is 42.

The square root of 123985761 is about 11134.8893573309. The cubic root of 123985761 is about 498.6440072249.

The spelling of 123985761 in words is "one hundred twenty-three million, nine hundred eighty-five thousand, seven hundred sixty-one".