47864521 has 2 divisors, whose sum is σ = 47864522. Its totient is φ = 47864520.

The previous prime is 47864519. The next prime is 47864533. The reversal of 47864521 is 12546874.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30525625 + 17338896 = 5525^2 + 4164^2 .

It is a cyclic number.

It is not a de Polignac number, because 47864521 - 2¹ = 47864519 is a prime.

Together with 47864519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (47864501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23932260 + 23932261.

It is an arithmetic number, because the mean of its divisors is an integer number (23932261).

Almost surely, 2^47864521 is an apocalyptic number.

It is an amenable number.

47864521 is a deficient number, since it is larger than the sum of its proper divisors (1).

47864521 is an equidigital number, since it uses as much as digits as its factorization.

47864521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 37.

The square root of 47864521 is about 6918.4189667871. The cubic root of 47864521 is about 363.0818773735.

The spelling of 47864521 in words is "forty-seven million, eight hundred sixty-four thousand, five hundred twenty-one".