5123529951721 has 2 divisors, whose sum is σ = 5123529951722. Its totient is φ = 5123529951720.

The previous prime is 5123529951643. The next prime is 5123529951737. The reversal of 5123529951721 is 1271599253215.

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., 4056151692121 + 1067378259600 = 2013989^2 + 1033140^2 .

It is a cyclic number.

It is not a de Polignac number, because 5123529951721 - 2²⁷ = 5123395733993 is a prime.

It is not a weakly prime, because it can be changed into another prime (5123529954721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2561764975860 + 2561764975861.

It is an arithmetic number, because the mean of its divisors is an integer number (2561764975861).

Almost surely, 2^{5123529951721} is an apocalyptic number.

It is an amenable number.

5123529951721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5123529951721 is an equidigital number, since it uses as much as digits as its factorization.

5123529951721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1701000, while the sum is 52.

The spelling of 5123529951721 in words is "five trillion, one hundred twenty-three billion, five hundred twenty-nine million, nine hundred fifty-one thousand, seven hundred twenty-one".