47117981 has 8 divisors (see below), whose sum is σ = 48474624. Its totient is φ = 45773280.

The previous prime is 47117969. The next prime is 47117989. The reversal of 47117981 is 18971174.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 47117981 - 2¹⁰ = 47116957 is a prime.

It is a super-2 number, since 2×47117981² = 4440208267032722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47117989) 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 7 ways as a sum of consecutive naturals, for example, 5345 + ... + 11081.

It is an arithmetic number, because the mean of its divisors is an integer number (6059328).

Almost surely, 2^47117981 is an apocalyptic number.

It is an amenable number.

47117981 is a deficient number, since it is larger than the sum of its proper divisors (1356643).

47117981 is a wasteful number, since it uses less digits than its factorization.

47117981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5971.

The product of its digits is 14112, while the sum is 38.

The square root of 47117981 is about 6864.2538560283. The cubic root of 47117981 is about 361.1843222994.

The spelling of 47117981 in words is "forty-seven million, one hundred seventeen thousand, nine hundred eighty-one".