47431861 has 4 divisors (see below), whose sum is σ = 47492172. Its totient is φ = 47371552.

The previous prime is 47431723. The next prime is 47431871. The reversal of 47431861 is 16813474.

It is a happy number.

47431861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16813474 = 2 ⋅8406737.

It can be written as a sum of positive squares in 2 ways, for example, as 6791236 + 40640625 = 2606^2 + 6375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47431861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47431871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28960 + ... + 30553.

It is an arithmetic number, because the mean of its divisors is an integer number (11873043).

Almost surely, 2^47431861 is an apocalyptic number.

It is an amenable number.

47431861 is a deficient number, since it is larger than the sum of its proper divisors (60311).

47431861 is an equidigital number, since it uses as much as digits as its factorization.

47431861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60310.

The product of its digits is 16128, while the sum is 34.

The square root of 47431861 is about 6887.0792793462. The cubic root of 47431861 is about 361.9845668664.

The spelling of 47431861 in words is "forty-seven million, four hundred thirty-one thousand, eight hundred sixty-one".