47831621 has 4 divisors (see below), whose sum is σ = 47845644. Its totient is φ = 47817600.

The previous prime is 47831617. The next prime is 47831627. The reversal of 47831621 is 12613874.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 19624900 + 28206721 = 4430^2 + 5311^2 .

It is a cyclic number.

It is not a de Polignac number, because 47831621 - 2² = 47831617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47831627) 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, 1781 + ... + 9941.

It is an arithmetic number, because the mean of its divisors is an integer number (11961411).

Almost surely, 2^47831621 is an apocalyptic number.

It is an amenable number.

47831621 is a deficient number, since it is larger than the sum of its proper divisors (14023).

47831621 is an equidigital number, since it uses as much as digits as its factorization.

47831621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14022.

The product of its digits is 8064, while the sum is 32.

The square root of 47831621 is about 6916.0408471900. The cubic root of 47831621 is about 362.9986693837.

The spelling of 47831621 in words is "forty-seven million, eight hundred thirty-one thousand, six hundred twenty-one".