47731621 has 4 divisors (see below), whose sum is σ = 54550432. Its totient is φ = 40912812.

The previous prime is 47731613. The next prime is 47731633. The reversal of 47731621 is 12613774.

47731621 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, and also an emirpimes, since its reverse is a distinct semiprime: 12613774 = 2 ⋅6306887.

It is a cyclic number.

It is not a de Polignac number, because 47731621 - 2³ = 47731613 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 (47735621) 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, 3409395 + ... + 3409408.

It is an arithmetic number, because the mean of its divisors is an integer number (13637608).

Almost surely, 2^47731621 is an apocalyptic number.

It is an amenable number.

47731621 is a deficient number, since it is larger than the sum of its proper divisors (6818811).

47731621 is an equidigital number, since it uses as much as digits as its factorization.

47731621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6818810.

The product of its digits is 7056, while the sum is 31.

The square root of 47731621 is about 6908.8074947852. The cubic root of 47731621 is about 362.7455230858.

The spelling of 47731621 in words is "forty-seven million, seven hundred thirty-one thousand, six hundred twenty-one".