47581381 has 4 divisors (see below), whose sum is σ = 47595712. Its totient is φ = 47567052.

The previous prime is 47581379. The next prime is 47581393. The reversal of 47581381 is 18318574.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18318574 = 2 ⋅9159287.

It is a cyclic number.

It is not a de Polignac number, because 47581381 - 2¹ = 47581379 is a prime.

It is a super-2 number, since 2×47581381² = 4527975635734322, 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 47581381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47581481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 676 + ... + 9778.

It is an arithmetic number, because the mean of its divisors is an integer number (11898928).

Almost surely, 2^47581381 is an apocalyptic number.

It is an amenable number.

47581381 is a deficient number, since it is larger than the sum of its proper divisors (14331).

47581381 is an equidigital number, since it uses as much as digits as its factorization.

47581381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14330.

The product of its digits is 26880, while the sum is 37.

The square root of 47581381 is about 6897.9258476733. The cubic root of 47581381 is about 362.3645305931.

The spelling of 47581381 in words is "forty-seven million, five hundred eighty-one thousand, three hundred eighty-one".