47539721 has 2 divisors, whose sum is σ = 47539722. Its totient is φ = 47539720.

The previous prime is 47539711. The next prime is 47539727. The reversal of 47539721 is 12793574.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33582025 + 13957696 = 5795^2 + 3736^2 .

It is a cyclic number.

It is not a de Polignac number, because 47539721 - 2¹⁴ = 47523337 is a prime.

It is not a weakly prime, because it can be changed into another prime (47539727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23769860 + 23769861.

It is an arithmetic number, because the mean of its divisors is an integer number (23769861).

Almost surely, 2^47539721 is an apocalyptic number.

It is an amenable number.

47539721 is a deficient number, since it is larger than the sum of its proper divisors (1).

47539721 is an equidigital number, since it uses as much as digits as its factorization.

47539721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 47539721 is about 6894.9054380753. The cubic root of 47539721 is about 362.2587433153.

The spelling of 47539721 in words is "forty-seven million, five hundred thirty-nine thousand, seven hundred twenty-one".