5128921873 has 2 divisors, whose sum is σ = 5128921874. Its totient is φ = 5128921872.

The previous prime is 5128921867. The next prime is 5128921909. The reversal of 5128921873 is 3781298215.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3782619009 + 1346302864 = 61503^2 + 36692^2 .

It is a cyclic number.

It is not a de Polignac number, because 5128921873 - 2⁵ = 5128921841 is a prime.

It is not a weakly prime, because it can be changed into another prime (5128921073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2564460936 + 2564460937.

It is an arithmetic number, because the mean of its divisors is an integer number (2564460937).

Almost surely, 2^5128921873 is an apocalyptic number.

It is an amenable number.

5128921873 is a deficient number, since it is larger than the sum of its proper divisors (1).

5128921873 is an equidigital number, since it uses as much as digits as its factorization.

5128921873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 46.

The square root of 5128921873 is about 71616.4916272781. The cubic root of 5128921873 is about 1724.5482957028.

The spelling of 5128921873 in words is "five billion, one hundred twenty-eight million, nine hundred twenty-one thousand, eight hundred seventy-three".