47987561 has 4 divisors (see below), whose sum is σ = 48105300. Its totient is φ = 47869824.

The previous prime is 47987531. The next prime is 47987581. The reversal of 47987561 is 16578974.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16578974 = 2 ⋅8289487.

It can be written as a sum of positive squares in 2 ways, for example, as 20529961 + 27457600 = 4531^2 + 5240^2 .

It is a cyclic number.

It is not a de Polignac number, because 47987561 - 2⁶ = 47987497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47987531) 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, 58256 + ... + 59073.

It is an arithmetic number, because the mean of its divisors is an integer number (12026325).

Almost surely, 2^47987561 is an apocalyptic number.

It is an amenable number.

47987561 is a deficient number, since it is larger than the sum of its proper divisors (117739).

47987561 is a wasteful number, since it uses less digits than its factorization.

47987561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117738.

The product of its digits is 423360, while the sum is 47.

The square root of 47987561 is about 6927.3054646089. The cubic root of 47987561 is about 363.3927225722.

The spelling of 47987561 in words is "forty-seven million, nine hundred eighty-seven thousand, five hundred sixty-one".