47721437513 has 2 divisors, whose sum is σ = 47721437514. Its totient is φ = 47721437512.

The previous prime is 47721437447. The next prime is 47721437549. The reversal of 47721437513 is 31573412774.

47721437513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44229454864 + 3491982649 = 210308^2 + 59093^2 .

It is a cyclic number.

It is not a de Polignac number, because 47721437513 - 2²² = 47717243209 is a prime.

It is not a weakly prime, because it can be changed into another prime (47721437713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23860718756 + 23860718757.

It is an arithmetic number, because the mean of its divisors is an integer number (23860718757).

Almost surely, 2^47721437513 is an apocalyptic number.

It is an amenable number.

47721437513 is a deficient number, since it is larger than the sum of its proper divisors (1).

47721437513 is an equidigital number, since it uses as much as digits as its factorization.

47721437513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 493920, while the sum is 44.

The spelling of 47721437513 in words is "forty-seven billion, seven hundred twenty-one million, four hundred thirty-seven thousand, five hundred thirteen".