123120172451 has 2 divisors, whose sum is σ = 123120172452. Its totient is φ = 123120172450.

The previous prime is 123120172429. The next prime is 123120172459. The reversal of 123120172451 is 154271021321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123120172451 - 2²² = 123115978147 is a prime.

It is not a weakly prime, because it can be changed into another prime (123120172459) 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, 61560086225 + 61560086226.

It is an arithmetic number, because the mean of its divisors is an integer number (61560086226).

Almost surely, 2^123120172451 is an apocalyptic number.

123120172451 is a deficient number, since it is larger than the sum of its proper divisors (1).

123120172451 is an equidigital number, since it uses as much as digits as its factorization.

123120172451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

Adding to 123120172451 its reverse (154271021321), we get a palindrome (277391193772).

The spelling of 123120172451 in words is "one hundred twenty-three billion, one hundred twenty million, one hundred seventy-two thousand, four hundred fifty-one".