123120100057 has 2 divisors, whose sum is σ = 123120100058. Its totient is φ = 123120100056.

The previous prime is 123120100043. The next prime is 123120100157. The reversal of 123120100057 is 750001021321.

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., 71686849536 + 51433250521 = 267744^2 + 226789^2 .

It is an emirp because it is prime and its reverse (750001021321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123120100057 - 2¹⁵ = 123120067289 is a prime.

It is not a weakly prime, because it can be changed into another prime (123120100157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61560050028 + 61560050029.

It is an arithmetic number, because the mean of its divisors is an integer number (61560050029).

Almost surely, 2^123120100057 is an apocalyptic number.

It is an amenable number.

123120100057 is a deficient number, since it is larger than the sum of its proper divisors (1).

123120100057 is an equidigital number, since it uses as much as digits as its factorization.

123120100057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 22.

Adding to 123120100057 its reverse (750001021321), we get a palindrome (873121121378).

The spelling of 123120100057 in words is "one hundred twenty-three billion, one hundred twenty million, one hundred thousand, fifty-seven".