49561 has 4 divisors (see below), whose sum is σ = 51300. Its totient is φ = 47824.

The previous prime is 49559. The next prime is 49597. The reversal of 49561 is 16594.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16594 = 2 ⋅8297.

It can be written as a sum of positive squares in 2 ways, for example, as 17161 + 32400 = 131^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 49561 - 2¹ = 49559 is a prime.

It is a Duffinian number.

49561 is a lucky number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (49531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826 + ... + 883.

It is an arithmetic number, because the mean of its divisors is an integer number (12825).

2⁴⁹⁵⁶¹ is an apocalyptic number.

It is an amenable number.

49561 is a deficient number, since it is larger than the sum of its proper divisors (1739).

49561 is a wasteful number, since it uses less digits than its factorization.

49561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738.

The product of its digits is 1080, while the sum is 25.

The square root of 49561 is about 222.6229997103. The cubic root of 49561 is about 36.7321785651.

The spelling of 49561 in words is "forty-nine thousand, five hundred sixty-one".