1243938173 has 2 divisors, whose sum is σ = 1243938174. Its totient is φ = 1243938172.

The previous prime is 1243938139. The next prime is 1243938191. The reversal of 1243938173 is 3718393421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1002228964 + 241709209 = 31658^2 + 15547^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243938173 - 2⁶ = 1243938109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1243938173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243938133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621969086 + 621969087.

It is an arithmetic number, because the mean of its divisors is an integer number (621969087).

Almost surely, 2^1243938173 is an apocalyptic number.

It is an amenable number.

1243938173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243938173 is an equidigital number, since it uses as much as digits as its factorization.

1243938173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 41.

The square root of 1243938173 is about 35269.5076943243. The cubic root of 1243938173 is about 1075.4732145558.

The spelling of 1243938173 in words is "one billion, two hundred forty-three million, nine hundred thirty-eight thousand, one hundred seventy-three".