123179503861 has 2 divisors, whose sum is σ = 123179503862. Its totient is φ = 123179503860.

The previous prime is 123179503849. The next prime is 123179503913. The reversal of 123179503861 is 168305971321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121501044900 + 1678458961 = 348570^2 + 40969^2 .

It is a cyclic number.

It is not a de Polignac number, because 123179503861 - 2²⁵ = 123145949429 is a prime.

It is a super-2 number, since 2×123179503861² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123179503661) 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 as a sum of consecutive naturals, namely, 61589751930 + 61589751931.

It is an arithmetic number, because the mean of its divisors is an integer number (61589751931).

Almost surely, 2^123179503861 is an apocalyptic number.

It is an amenable number.

123179503861 is a deficient number, since it is larger than the sum of its proper divisors (1).

123179503861 is an equidigital number, since it uses as much as digits as its factorization.

123179503861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 123179503861 in words is "one hundred twenty-three billion, one hundred seventy-nine million, five hundred three thousand, eight hundred sixty-one".