47681561 has 2 divisors, whose sum is σ = 47681562. Its totient is φ = 47681560.

The previous prime is 47681551. The next prime is 47681573. The reversal of 47681561 is 16518674.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27825625 + 19855936 = 5275^2 + 4456^2 .

It is a cyclic number.

It is not a de Polignac number, because 47681561 - 2⁶ = 47681497 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (47681521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23840780 + 23840781.

It is an arithmetic number, because the mean of its divisors is an integer number (23840781).

Almost surely, 2^47681561 is an apocalyptic number.

It is an amenable number.

47681561 is a deficient number, since it is larger than the sum of its proper divisors (1).

47681561 is an equidigital number, since it uses as much as digits as its factorization.

47681561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 47681561 is about 6905.1836326053. The cubic root of 47681561 is about 362.6186652329.

The spelling of 47681561 in words is "forty-seven million, six hundred eighty-one thousand, five hundred sixty-one".