123927961 has 4 divisors (see below), whose sum is σ = 125320500. Its totient is φ = 122535424.

The previous prime is 123927949. The next prime is 123927989. The reversal of 123927961 is 169729321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169729321 = 911 ⋅186311.

It can be written as a sum of positive squares in 2 ways, for example, as 88454025 + 35473936 = 9405^2 + 5956^2 .

It is a cyclic number.

It is not a de Polignac number, because 123927961 - 2⁵ = 123927929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123927901) 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, 696136 + ... + 696313.

It is an arithmetic number, because the mean of its divisors is an integer number (31330125).

Almost surely, 2^123927961 is an apocalyptic number.

It is an amenable number.

123927961 is a deficient number, since it is larger than the sum of its proper divisors (1392539).

123927961 is an equidigital number, since it uses as much as digits as its factorization.

123927961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392538.

The product of its digits is 40824, while the sum is 40.

The square root of 123927961 is about 11132.2936091355. The cubic root of 123927961 is about 498.5665088002.

The spelling of 123927961 in words is "one hundred twenty-three million, nine hundred twenty-seven thousand, nine hundred sixty-one".