5177521991 has 2 divisors, whose sum is σ = 5177521992. Its totient is φ = 5177521990.

The previous prime is 5177521981. The next prime is 5177522081. The reversal of 5177521991 is 1991257715.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5177521991 - 2¹⁰ = 5177520967 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5177521981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2588760995 + 2588760996.

It is an arithmetic number, because the mean of its divisors is an integer number (2588760996).

Almost surely, 2^5177521991 is an apocalyptic number.

5177521991 is a deficient number, since it is larger than the sum of its proper divisors (1).

5177521991 is an equidigital number, since it uses as much as digits as its factorization.

5177521991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 198450, while the sum is 47.

The square root of 5177521991 is about 71954.9997637412. Note that the first 3 decimals coincide. The cubic root of 5177521991 is about 1729.9782806589.

The spelling of 5177521991 in words is "five billion, one hundred seventy-seven million, five hundred twenty-one thousand, nine hundred ninety-one".