47561581 has 4 divisors (see below), whose sum is σ = 47625664. Its totient is φ = 47497500.

The previous prime is 47561567. The next prime is 47561593. The reversal of 47561581 is 18516574.

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.

It is a cyclic number.

It is not a de Polignac number, because 47561581 - 2⁷ = 47561453 is a prime.

It is a super-2 number, since 2×47561581² = 4524207974439122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 47561581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47561531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30915 + ... + 32416.

It is an arithmetic number, because the mean of its divisors is an integer number (11906416).

Almost surely, 2^47561581 is an apocalyptic number.

It is an amenable number.

47561581 is a deficient number, since it is larger than the sum of its proper divisors (64083).

47561581 is an equidigital number, since it uses as much as digits as its factorization.

47561581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64082.

The product of its digits is 33600, while the sum is 37.

The square root of 47561581 is about 6896.4904842971. The cubic root of 47561581 is about 362.3142601371.

The spelling of 47561581 in words is "forty-seven million, five hundred sixty-one thousand, five hundred eighty-one".