743561081 has 2 divisors, whose sum is σ = 743561082. Its totient is φ = 743561080.

The previous prime is 743561057. The next prime is 743561099. The reversal of 743561081 is 180165347.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397005625 + 346555456 = 19925^2 + 18616^2 .

It is an emirp because it is prime and its reverse (180165347) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 743561081 - 2¹⁰ = 743560057 is a prime.

It is a super-3 number, since 3×743561081³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (743561681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371780540 + 371780541.

It is an arithmetic number, because the mean of its divisors is an integer number (371780541).

Almost surely, 2^743561081 is an apocalyptic number.

It is an amenable number.

743561081 is a deficient number, since it is larger than the sum of its proper divisors (1).

743561081 is an equidigital number, since it uses as much as digits as its factorization.

743561081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 743561081 is about 27268.3164313457. The cubic root of 743561081 is about 905.9527550503.

The spelling of 743561081 in words is "seven hundred forty-three million, five hundred sixty-one thousand, eighty-one".