5128564997 has 4 divisors (see below), whose sum is σ = 5165999916. Its totient is φ = 5091130080.

The previous prime is 5128564993. The next prime is 5128564999. The reversal of 5128564997 is 7994658215.

It is a Cunningham number, because it is equal to 71614²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3012472996 + 2116092001 = 54886^2 + 46001^2 .

It is a cyclic number.

It is not a de Polignac number, because 5128564997 - 2² = 5128564993 is a prime.

It is a super-2 number, since 2×5128564997² = 52604357856907220018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5128564993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18717254 + ... + 18717527.

It is an arithmetic number, because the mean of its divisors is an integer number (1291499979).

Almost surely, 2^5128564997 is an apocalyptic number.

It is an amenable number.

5128564997 is a deficient number, since it is larger than the sum of its proper divisors (37434919).

5128564997 is a wasteful number, since it uses less digits than its factorization.

5128564997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37434918.

The product of its digits is 5443200, while the sum is 56.

The square root of 5128564997 is about 71614.0000069819. Note that the first 5 decimals coincide. The cubic root of 5128564997 is about 1724.5082961221.

The spelling of 5128564997 in words is "five billion, one hundred twenty-eight million, five hundred sixty-four thousand, nine hundred ninety-seven".