5128891 has 2 divisors, whose sum is σ = 5128892. Its totient is φ = 5128890.

The previous prime is 5128889. The next prime is 5128897. The reversal of 5128891 is 1988215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5128891 - 2¹ = 5128889 is a prime.

Together with 5128889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (5128897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2564445 + 2564446.

It is an arithmetic number, because the mean of its divisors is an integer number (2564446).

Almost surely, 2^5128891 is an apocalyptic number.

5128891 is a deficient number, since it is larger than the sum of its proper divisors (1).

5128891 is an equidigital number, since it uses as much as digits as its factorization.

5128891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 34.

The square root of 5128891 is about 2264.7054996180. The cubic root of 5128891 is about 172.4544835451.

The spelling of 5128891 in words is "five million, one hundred twenty-eight thousand, eight hundred ninety-one".