743000081 has 2 divisors, whose sum is σ = 743000082. Its totient is φ = 743000080.

The previous prime is 743000077. The next prime is 743000087. The reversal of 743000081 is 180000347.

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., 725494225 + 17505856 = 26935^2 + 4184^2 .

It is a cyclic number.

It is not a de Polignac number, because 743000081 - 2² = 743000077 is a prime.

It is a super-2 number, since 2×743000081² = 1104098240732013122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (743000087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371500040 + 371500041.

It is an arithmetic number, because the mean of its divisors is an integer number (371500041).

Almost surely, 2^743000081 is an apocalyptic number.

It is an amenable number.

743000081 is a deficient number, since it is larger than the sum of its proper divisors (1).

743000081 is an equidigital number, since it uses as much as digits as its factorization.

743000081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 743000081 is about 27258.0278266789. The cubic root of 743000081 is about 905.7248574457.

The spelling of 743000081 in words is "seven hundred forty-three million, eighty-one", and thus it is an aban number.