123591961 has 4 divisors (see below), whose sum is σ = 125686800. Its totient is φ = 121497124.

The previous prime is 123591953. The next prime is 123591967. The reversal of 123591961 is 169195321.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 169195321 = 1487 ⋅113783.

It is a cyclic number.

It is not a de Polignac number, because 123591961 - 2³ = 123591953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123591961.

It is not an unprimeable number, because it can be changed into a prime (123591967) 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, 1047331 + ... + 1047448.

It is an arithmetic number, because the mean of its divisors is an integer number (31421700).

Almost surely, 2^123591961 is an apocalyptic number.

It is an amenable number.

123591961 is a deficient number, since it is larger than the sum of its proper divisors (2094839).

123591961 is an equidigital number, since it uses as much as digits as its factorization.

123591961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2094838.

The product of its digits is 14580, while the sum is 37.

The square root of 123591961 is about 11117.1921365064. The cubic root of 123591961 is about 498.1155210680.

The spelling of 123591961 in words is "one hundred twenty-three million, five hundred ninety-one thousand, nine hundred sixty-one".