47381881 has 4 divisors (see below), whose sum is σ = 47870452. Its totient is φ = 46893312.

The previous prime is 47381879. The next prime is 47381899. The reversal of 47381881 is 18818374.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18818374 = 2 ⋅9409187.

It can be written as a sum of positive squares in 2 ways, for example, as 32490000 + 14891881 = 5700^2 + 3859^2 .

It is a cyclic number.

It is not a de Polignac number, because 47381881 - 2¹ = 47381879 is a prime.

It is a super-2 number, since 2×47381881² = 4490085294196322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47331881) 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, 244140 + ... + 244333.

It is an arithmetic number, because the mean of its divisors is an integer number (11967613).

Almost surely, 2^47381881 is an apocalyptic number.

It is an amenable number.

47381881 is a deficient number, since it is larger than the sum of its proper divisors (488571).

47381881 is an equidigital number, since it uses as much as digits as its factorization.

47381881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488570.

The product of its digits is 43008, while the sum is 40.

The square root of 47381881 is about 6883.4497891682. The cubic root of 47381881 is about 361.8573784700.

The spelling of 47381881 in words is "forty-seven million, three hundred eighty-one thousand, eight hundred eighty-one".