1493038181 has 2 divisors, whose sum is σ = 1493038182. Its totient is φ = 1493038180.

The previous prime is 1493038177. The next prime is 1493038187. The reversal of 1493038181 is 1818303941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1451229025 + 41809156 = 38095^2 + 6466^2 .

It is an emirp because it is prime and its reverse (1818303941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1493038181 - 2² = 1493038177 is a prime.

It is a super-2 number, since 2×1493038181² = 4458326019847577522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1493038187) 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, 746519090 + 746519091.

It is an arithmetic number, because the mean of its divisors is an integer number (746519091).

Almost surely, 2^1493038181 is an apocalyptic number.

It is an amenable number.

1493038181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1493038181 is an equidigital number, since it uses as much as digits as its factorization.

1493038181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1493038181 is about 38639.8522383303. The cubic root of 1493038181 is about 1142.9405415947.

The spelling of 1493038181 in words is "one billion, four hundred ninety-three million, thirty-eight thousand, one hundred eighty-one".