47185981 has 2 divisors, whose sum is σ = 47185982. Its totient is φ = 47185980.

The previous prime is 47185973. The next prime is 47185997. The reversal of 47185981 is 18958174.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38862756 + 8323225 = 6234^2 + 2885^2 .

It is a cyclic number.

It is not a de Polignac number, because 47185981 - 2³ = 47185973 is a prime.

It is a super-2 number, since 2×47185981² = 4453033605864722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47165981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23592990 + 23592991.

It is an arithmetic number, because the mean of its divisors is an integer number (23592991).

Almost surely, 2^47185981 is an apocalyptic number.

It is an amenable number.

47185981 is a deficient number, since it is larger than the sum of its proper divisors (1).

47185981 is an equidigital number, since it uses as much as digits as its factorization.

47185981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 43.

The square root of 47185981 is about 6869.2052669869. The cubic root of 47185981 is about 361.3579908064.

The spelling of 47185981 in words is "forty-seven million, one hundred eighty-five thousand, nine hundred eighty-one".