47606439721 has 9 divisors (see below), whose sum is σ = 48936173349. Its totient is φ = 46311924384.

The previous prime is 47606439709. The next prime is 47606439733. The reversal of 47606439721 is 12793460674.

The square root of 47606439721 is 218189.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (47606439709) and next prime (47606439733).

It can be written as a sum of positive squares in 4 ways, for example, as 31634535321 + 15971904400 = 177861^2 + 126380^2 .

It is not a de Polignac number, because 47606439721 - 2⁵ = 47606439689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47606439781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8070045 + ... + 8075941.

Almost surely, 2^47606439721 is an apocalyptic number.

47606439721 is the 218189-th square number.

47606439721 is the 109095-th centered octagonal number.

It is an amenable number.

47606439721 is a deficient number, since it is larger than the sum of its proper divisors (1329733628).

47606439721 is an frugal number, since it uses more digits than its factorization.

47606439721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11868 (or 5934 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 49.

Multiplying 47606439721 by its sum of digits (49), we get a square (2332715546329 = 1527323²).

The spelling of 47606439721 in words is "forty-seven billion, six hundred six million, four hundred thirty-nine thousand, seven hundred twenty-one".