1200123173 has 2 divisors, whose sum is σ = 1200123174. Its totient is φ = 1200123172.

The previous prime is 1200123161. The next prime is 1200123241. The reversal of 1200123173 is 3713210021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 975812644 + 224310529 = 31238^2 + 14977^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200123173 - 2¹⁸ = 1199861029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200123103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600061586 + 600061587.

It is an arithmetic number, because the mean of its divisors is an integer number (600061587).

Almost surely, 2^1200123173 is an apocalyptic number.

It is an amenable number.

1200123173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200123173 is an equidigital number, since it uses as much as digits as its factorization.

1200123173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 1200123173 is about 34642.7939548761. The cubic root of 1200123173 is about 1062.6949265064.

Adding to 1200123173 its reverse (3713210021), we get a palindrome (4913333194).

The spelling of 1200123173 in words is "one billion, two hundred million, one hundred twenty-three thousand, one hundred seventy-three".