5128691 has 2 divisors, whose sum is σ = 5128692. Its totient is φ = 5128690.

The previous prime is 5128667. The next prime is 5128723. The reversal of 5128691 is 1968215.

5128691 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (5128723) can be obtained adding 5128691 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5128691 - 2¹⁴ = 5112307 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (5128661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2564345 + 2564346.

It is an arithmetic number, because the mean of its divisors is an integer number (2564346).

Almost surely, 2^5128691 is an apocalyptic number.

5128691 is a deficient number, since it is larger than the sum of its proper divisors (1).

5128691 is an equidigital number, since it uses as much as digits as its factorization.

5128691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 32.

The square root of 5128691 is about 2264.6613433359. The cubic root of 5128691 is about 172.4522419075.

The spelling of 5128691 in words is "five million, one hundred twenty-eight thousand, six hundred ninety-one".