47739781 has 2 divisors, whose sum is σ = 47739782. Its totient is φ = 47739780.

The previous prime is 47739767. The next prime is 47739787. The reversal of 47739781 is 18793774.

47739781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32878756 + 14861025 = 5734^2 + 3855^2 .

It is a cyclic number.

It is not a de Polignac number, because 47739781 - 2⁹ = 47739269 is a prime.

It is a super-2 number, since 2×47739781² = 4558173379855922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47739787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23869890 + 23869891.

It is an arithmetic number, because the mean of its divisors is an integer number (23869891).

Almost surely, 2^47739781 is an apocalyptic number.

It is an amenable number.

47739781 is a deficient number, since it is larger than the sum of its proper divisors (1).

47739781 is an equidigital number, since it uses as much as digits as its factorization.

47739781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 296352, while the sum is 46.

The square root of 47739781 is about 6909.3980200883. The cubic root of 47739781 is about 362.7661930648.

The spelling of 47739781 in words is "forty-seven million, seven hundred thirty-nine thousand, seven hundred eighty-one".