743718161 has 4 divisors (see below), whose sum is σ = 755910324. Its totient is φ = 731526000.

The previous prime is 743718149. The next prime is 743718163. The reversal of 743718161 is 161817347.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161817347 = 7591 ⋅21317.

It can be written as a sum of positive squares in 2 ways, for example, as 279057025 + 464661136 = 16705^2 + 21556^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-743718161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (743718163) 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, 6095990 + ... + 6096111.

It is an arithmetic number, because the mean of its divisors is an integer number (188977581).

Almost surely, 2^743718161 is an apocalyptic number.

It is an amenable number.

743718161 is a deficient number, since it is larger than the sum of its proper divisors (12192163).

743718161 is a wasteful number, since it uses less digits than its factorization.

743718161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12192162.

The product of its digits is 28224, while the sum is 38.

The square root of 743718161 is about 27271.1965450730. The cubic root of 743718161 is about 906.0165458370.

The spelling of 743718161 in words is "seven hundred forty-three million, seven hundred eighteen thousand, one hundred sixty-one".