47518781 has 2 divisors, whose sum is σ = 47518782. Its totient is φ = 47518780.

The previous prime is 47518771. The next prime is 47518787. The reversal of 47518781 is 18781574.

47518781 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., 34916281 + 12602500 = 5909^2 + 3550^2 .

It is a cyclic number.

It is not a de Polignac number, because 47518781 - 2¹⁸ = 47256637 is a prime.

It is a super-2 number, since 2×47518781² = 4516069095451922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47518787) 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, 23759390 + 23759391.

It is an arithmetic number, because the mean of its divisors is an integer number (23759391).

Almost surely, 2^47518781 is an apocalyptic number.

It is an amenable number.

47518781 is a deficient number, since it is larger than the sum of its proper divisors (1).

47518781 is an equidigital number, since it uses as much as digits as its factorization.

47518781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62720, while the sum is 41.

The square root of 47518781 is about 6893.3867583358. The cubic root of 47518781 is about 362.2055470129.

The spelling of 47518781 in words is "forty-seven million, five hundred eighteen thousand, seven hundred eighty-one".