47487521 has 2 divisors, whose sum is σ = 47487522. Its totient is φ = 47487520.

The previous prime is 47487509. The next prime is 47487541. The reversal of 47487521 is 12578474.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37945600 + 9541921 = 6160^2 + 3089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47487521 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (47487541) 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, 23743760 + 23743761.

It is an arithmetic number, because the mean of its divisors is an integer number (23743761).

Almost surely, 2^47487521 is an apocalyptic number.

It is an amenable number.

47487521 is a deficient number, since it is larger than the sum of its proper divisors (1).

47487521 is an equidigital number, since it uses as much as digits as its factorization.

47487521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62720, while the sum is 38.

The square root of 47487521 is about 6891.1189947642. The cubic root of 47487521 is about 362.1261045350.

The spelling of 47487521 in words is "forty-seven million, four hundred eighty-seven thousand, five hundred twenty-one".