1242320173 has 2 divisors, whose sum is σ = 1242320174. Its totient is φ = 1242320172.

The previous prime is 1242320161. The next prime is 1242320201. The reversal of 1242320173 is 3710232421.

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., 1098392164 + 143928009 = 33142^2 + 11997^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242320173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242320143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621160086 + 621160087.

It is an arithmetic number, because the mean of its divisors is an integer number (621160087).

Almost surely, 2^1242320173 is an apocalyptic number.

It is an amenable number.

1242320173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242320173 is an equidigital number, since it uses as much as digits as its factorization.

1242320173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 1242320173 is about 35246.5625699869. The cubic root of 1242320173 is about 1075.0067201311.

Adding to 1242320173 its reverse (3710232421), we get a palindrome (4952552594).

The spelling of 1242320173 in words is "one billion, two hundred forty-two million, three hundred twenty thousand, one hundred seventy-three".