747561 has 4 divisors (see below), whose sum is σ = 996752. Its totient is φ = 498372.

The previous prime is 747557. The next prime is 747563. The reversal of 747561 is 165747.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165747 = 3 ⋅55249.

It is not a de Polignac number, because 747561 - 2² = 747557 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (747563) 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, 124591 + ... + 124596.

It is an arithmetic number, because the mean of its divisors is an integer number (249188).

2⁷⁴⁷⁵⁶¹ is an apocalyptic number.

It is an amenable number.

747561 is a deficient number, since it is larger than the sum of its proper divisors (249191).

747561 is a wasteful number, since it uses less digits than its factorization.

747561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249190.

The product of its digits is 5880, while the sum is 30.

The square root of 747561 is about 864.6160997807. The cubic root of 747561 is about 90.7574347513.

The spelling of 747561 in words is "seven hundred forty-seven thousand, five hundred sixty-one".