743773561 has 4 divisors (see below), whose sum is σ = 746420724. Its totient is φ = 741126400.

The previous prime is 743773553. The next prime is 743773573. The reversal of 743773561 is 165377347.

743773561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165377347 = 181 ⋅913687.

It can be written as a sum of positive squares in 2 ways, for example, as 564347536 + 179426025 = 23756^2 + 13395^2 .

It is a cyclic number.

It is not a de Polignac number, because 743773561 - 2³ = 743773553 is a prime.

It is a super-2 number, since 2×743773561² = 1106398220085241442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (743773501) 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, 1323160 + ... + 1323721.

It is an arithmetic number, because the mean of its divisors is an integer number (186605181).

Almost surely, 2^743773561 is an apocalyptic number.

It is an amenable number.

743773561 is a deficient number, since it is larger than the sum of its proper divisors (2647163).

743773561 is a wasteful number, since it uses less digits than its factorization.

743773561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2647162.

The product of its digits is 370440, while the sum is 43.

The square root of 743773561 is about 27272.2122498341. The cubic root of 743773561 is about 906.0390418455.

The spelling of 743773561 in words is "seven hundred forty-three million, seven hundred seventy-three thousand, five hundred sixty-one".