47851521 has 4 divisors (see below), whose sum is σ = 63802032. Its totient is φ = 31901012.

The previous prime is 47851501. The next prime is 47851543. The reversal of 47851521 is 12515874.

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 a cyclic number.

It is not a de Polignac number, because 47851521 - 2¹⁰ = 47850497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (47851501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7975251 + ... + 7975256.

It is an arithmetic number, because the mean of its divisors is an integer number (15950508).

Almost surely, 2^47851521 is an apocalyptic number.

It is an amenable number.

47851521 is a deficient number, since it is larger than the sum of its proper divisors (15950511).

47851521 is a wasteful number, since it uses less digits than its factorization.

47851521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15950510.

The product of its digits is 11200, while the sum is 33.

The square root of 47851521 is about 6917.4793819714. The cubic root of 47851521 is about 363.0490033944.

The spelling of 47851521 in words is "forty-seven million, eight hundred fifty-one thousand, five hundred twenty-one".