743581381 has 4 divisors (see below), whose sum is σ = 743647500. Its totient is φ = 743515264.

The previous prime is 743581351. The next prime is 743581393. The reversal of 743581381 is 183185347.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 183185347 = 211 ⋅868177.

It can be written as a sum of positive squares in 2 ways, for example, as 485497156 + 258084225 = 22034^2 + 16065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-743581381 is a prime.

It is a super-2 number, since 2×743581381² = 1105826540339734322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (743581331) 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 in 3 ways as a sum of consecutive naturals, for example, 11506 + ... + 40243.

It is an arithmetic number, because the mean of its divisors is an integer number (185911875).

Almost surely, 2^743581381 is an apocalyptic number.

It is an amenable number.

743581381 is a deficient number, since it is larger than the sum of its proper divisors (66119).

743581381 is a wasteful number, since it uses less digits than its factorization.

743581381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66118.

The product of its digits is 80640, while the sum is 40.

The square root of 743581381 is about 27268.6886556725. The cubic root of 743581381 is about 905.9609994631.

The spelling of 743581381 in words is "seven hundred forty-three million, five hundred eighty-one thousand, three hundred eighty-one".