47849981 has 2 divisors, whose sum is σ = 47849982. Its totient is φ = 47849980.

The previous prime is 47849969. The next prime is 47849983. The reversal of 47849981 is 18994874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41925625 + 5924356 = 6475^2 + 2434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47849981 is a prime.

It is a super-2 number, since 2×47849981² = 4579241363400722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 47849983, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47849983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23924990 + 23924991.

It is an arithmetic number, because the mean of its divisors is an integer number (23924991).

Almost surely, 2^47849981 is an apocalyptic number.

It is an amenable number.

47849981 is a deficient number, since it is larger than the sum of its proper divisors (1).

47849981 is an equidigital number, since it uses as much as digits as its factorization.

47849981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 50.

The square root of 47849981 is about 6917.3680688539. The cubic root of 47849981 is about 363.0451086978.

The spelling of 47849981 in words is "forty-seven million, eight hundred forty-nine thousand, nine hundred eighty-one".