47944181 has 2 divisors, whose sum is σ = 47944182. Its totient is φ = 47944180.

The previous prime is 47944157. The next prime is 47944187. The reversal of 47944181 is 18144974.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46799281 + 1144900 = 6841^2 + 1070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47944181 is a prime.

It is a super-2 number, since 2×47944181² = 4597288983521522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47944187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23972090 + 23972091.

It is an arithmetic number, because the mean of its divisors is an integer number (23972091).

Almost surely, 2^47944181 is an apocalyptic number.

It is an amenable number.

47944181 is a deficient number, since it is larger than the sum of its proper divisors (1).

47944181 is an equidigital number, since it uses as much as digits as its factorization.

47944181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 38.

The square root of 47944181 is about 6924.1736691103. The cubic root of 47944181 is about 363.2831891258.

The spelling of 47944181 in words is "forty-seven million, nine hundred forty-four thousand, one hundred eighty-one".