47987181 has 16 divisors (see below), whose sum is σ = 77555520. Its totient is φ = 29082960.

The previous prime is 47987153. The next prime is 47987201. The reversal of 47987181 is 18178974.

It is not a de Polignac number, because 47987181 - 2⁶ = 47987117 is a prime.

It is a super-2 number, since 2×47987181² = 4605539080653522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47987581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80490 + ... + 81083.

It is an arithmetic number, because the mean of its divisors is an integer number (4847220).

Almost surely, 2^47987181 is an apocalyptic number.

It is an amenable number.

47987181 is a deficient number, since it is larger than the sum of its proper divisors (29568339).

47987181 is a wasteful number, since it uses less digits than its factorization.

47987181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161593 (or 161587 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 47987181 is about 6927.2780368627. The cubic root of 47987181 is about 363.3917633681.

The spelling of 47987181 in words is "forty-seven million, nine hundred eighty-seven thousand, one hundred eighty-one".