47521791 has 24 divisors (see below), whose sum is σ = 71884800. Its totient is φ = 30214800.

The previous prime is 47521781. The next prime is 47521819. The reversal of 47521791 is 19712574.

It is a happy number.

47521791 is a `hidden beast` number, since 47 + 521 + 7 + 91 = 666.

It is not a de Polignac number, because 47521791 - 2¹⁵ = 47489023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47521741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18610 + ... + 21008.

It is an arithmetic number, because the mean of its divisors is an integer number (2995200).

Almost surely, 2^47521791 is an apocalyptic number.

47521791 is a deficient number, since it is larger than the sum of its proper divisors (24363009).

47521791 is a wasteful number, since it uses less digits than its factorization.

47521791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2507 (or 2504 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 47521791 is about 6893.6050800724. The cubic root of 47521791 is about 362.2131946255.

The spelling of 47521791 in words is "forty-seven million, five hundred twenty-one thousand, seven hundred ninety-one".