47591921 has 6 divisors (see below), whose sum is σ = 51534630. Its totient is φ = 43930848.

The previous prime is 47591917. The next prime is 47591969. The reversal of 47591921 is 12919574.

It can be written as a sum of positive squares in 3 ways, for example, as 1079521 + 46512400 = 1039^2 + 6820^2 .

It is not a de Polignac number, because 47591921 - 2² = 47591917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (47591911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 140636 + ... + 140973.

It is an arithmetic number, because the mean of its divisors is an integer number (8589105).

Almost surely, 2^47591921 is an apocalyptic number.

It is an amenable number.

47591921 is a deficient number, since it is larger than the sum of its proper divisors (3942709).

47591921 is a wasteful number, since it uses less digits than its factorization.

47591921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281635 (or 281622 counting only the distinct ones).

The product of its digits is 22680, while the sum is 38.

The square root of 47591921 is about 6898.6898031438. The cubic root of 47591921 is about 362.3912850370.

The spelling of 47591921 in words is "forty-seven million, five hundred ninety-one thousand, nine hundred twenty-one".