47787521 has 2 divisors, whose sum is σ = 47787522. Its totient is φ = 47787520.

The previous prime is 47787517. The next prime is 47787529. The reversal of 47787521 is 12578774.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47761921 + 25600 = 6911^2 + 160^2 .

It is a cyclic number.

It is not a de Polignac number, because 47787521 - 2² = 47787517 is a prime.

It is not a weakly prime, because it can be changed into another prime (47787529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23893760 + 23893761.

It is an arithmetic number, because the mean of its divisors is an integer number (23893761).

Almost surely, 2^47787521 is an apocalyptic number.

It is an amenable number.

47787521 is a deficient number, since it is larger than the sum of its proper divisors (1).

47787521 is an equidigital number, since it uses as much as digits as its factorization.

47787521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 109760, while the sum is 41.

The square root of 47787521 is about 6912.8518716952. The cubic root of 47787521 is about 362.8870753985.

The spelling of 47787521 in words is "forty-seven million, seven hundred eighty-seven thousand, five hundred twenty-one".