8749561 has 8 divisors (see below), whose sum is σ = 9177480. Its totient is φ = 8330112.

The previous prime is 8749549. The next prime is 8749571. The reversal of 8749561 is 1659478.

It can be written as a sum of positive squares in 4 ways, for example, as 2499561 + 6250000 = 1581^2 + 2500^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8749561 - 2⁹ = 8749049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8749571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51 + ... + 4183.

It is an arithmetic number, because the mean of its divisors is an integer number (1147185).

Almost surely, 2^8749561 is an apocalyptic number.

It is an amenable number.

8749561 is a deficient number, since it is larger than the sum of its proper divisors (427919).

8749561 is a wasteful number, since it uses less digits than its factorization.

8749561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4235.

The product of its digits is 60480, while the sum is 40.

The square root of 8749561 is about 2957.9656860755. The cubic root of 8749561 is about 206.0608187533.

The spelling of 8749561 in words is "eight million, seven hundred forty-nine thousand, five hundred sixty-one".