47131521 has 4 divisors (see below), whose sum is σ = 62842032. Its totient is φ = 31421012.

The previous prime is 47131519. The next prime is 47131523. The reversal of 47131521 is 12513174.

47131521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (47131519) and next prime (47131523).

It is a cyclic number.

It is not a de Polignac number, because 47131521 - 2¹ = 47131519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 47131491 and 47131500.

It is not an unprimeable number, because it can be changed into a prime (47131523) 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 in 3 ways as a sum of consecutive naturals, for example, 7855251 + ... + 7855256.

It is an arithmetic number, because the mean of its divisors is an integer number (15710508).

Almost surely, 2^47131521 is an apocalyptic number.

It is an amenable number.

47131521 is a deficient number, since it is larger than the sum of its proper divisors (15710511).

47131521 is a wasteful number, since it uses less digits than its factorization.

47131521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15710510.

The product of its digits is 840, while the sum is 24.

The square root of 47131521 is about 6865.2400540695. The cubic root of 47131521 is about 361.2189160804.

Adding to 47131521 its reverse (12513174), we get a palindrome (59644695).

The spelling of 47131521 in words is "forty-seven million, one hundred thirty-one thousand, five hundred twenty-one".