123154123117 has 2 divisors, whose sum is σ = 123154123118. Its totient is φ = 123154123116.

The previous prime is 123154123063. The next prime is 123154123151. The reversal of 123154123117 is 711321451321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90255781476 + 32898341641 = 300426^2 + 181379^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123154123117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123154123217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61577061558 + 61577061559.

It is an arithmetic number, because the mean of its divisors is an integer number (61577061559).

Almost surely, 2^123154123117 is an apocalyptic number.

It is an amenable number.

123154123117 is a deficient number, since it is larger than the sum of its proper divisors (1).

123154123117 is an equidigital number, since it uses as much as digits as its factorization.

123154123117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 31.

Adding to 123154123117 its reverse (711321451321), we get a palindrome (834475574438).

The spelling of 123154123117 in words is "one hundred twenty-three billion, one hundred fifty-four million, one hundred twenty-three thousand, one hundred seventeen".