47437721 has 2 divisors, whose sum is σ = 47437722. Its totient is φ = 47437720.

The previous prime is 47437681. The next prime is 47437723. The reversal of 47437721 is 12773474.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46854025 + 583696 = 6845^2 + 764^2 .

It is a cyclic number.

It is not a de Polignac number, because 47437721 - 2¹⁴ = 47421337 is a prime.

Together with 47437723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (47437723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23718860 + 23718861.

It is an arithmetic number, because the mean of its divisors is an integer number (23718861).

Almost surely, 2^47437721 is an apocalyptic number.

It is an amenable number.

47437721 is a deficient number, since it is larger than the sum of its proper divisors (1).

47437721 is an equidigital number, since it uses as much as digits as its factorization.

47437721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32928, while the sum is 35.

The square root of 47437721 is about 6887.5047005429. The cubic root of 47437721 is about 361.9994734585. Note that the first 3 decimals are identical.

The spelling of 47437721 in words is "forty-seven million, four hundred thirty-seven thousand, seven hundred twenty-one".