743147561 has 4 divisors (see below), whose sum is σ = 800312772. Its totient is φ = 685982352.

The previous prime is 743147491. The next prime is 743147563. The reversal of 743147561 is 165741347.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165741347 = 17 ⋅9749491.

It can be written as a sum of positive squares in 2 ways, for example, as 129049600 + 614097961 = 11360^2 + 24781^2 .

It is a cyclic number.

It is not a de Polignac number, because 743147561 - 2¹⁸ = 742885417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (743147563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28582586 + ... + 28582611.

It is an arithmetic number, because the mean of its divisors is an integer number (200078193).

Almost surely, 2^743147561 is an apocalyptic number.

It is an amenable number.

743147561 is a deficient number, since it is larger than the sum of its proper divisors (57165211).

743147561 is a wasteful number, since it uses less digits than its factorization.

743147561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57165210.

The product of its digits is 70560, while the sum is 38.

The square root of 743147561 is about 27260.7329505279. The cubic root of 743147561 is about 905.7847800345.

The spelling of 743147561 in words is "seven hundred forty-three million, one hundred forty-seven thousand, five hundred sixty-one".