47621689 has 2 divisors, whose sum is σ = 47621690. Its totient is φ = 47621688.

The previous prime is 47621687. The next prime is 47621699. The reversal of 47621689 is 98612674.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27667600 + 19954089 = 5260^2 + 4467^2 .

It is a cyclic number.

It is not a de Polignac number, because 47621689 - 2¹ = 47621687 is a prime.

Together with 47621687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (47621681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23810844 + 23810845.

It is an arithmetic number, because the mean of its divisors is an integer number (23810845).

Almost surely, 2^47621689 is an apocalyptic number.

It is an amenable number.

47621689 is a deficient number, since it is larger than the sum of its proper divisors (1).

47621689 is an equidigital number, since it uses as much as digits as its factorization.

47621689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 47621689 is about 6900.8469770022. The cubic root of 47621689 is about 362.4668259773.

The spelling of 47621689 in words is "forty-seven million, six hundred twenty-one thousand, six hundred eighty-nine".