5205513991 has 2 divisors, whose sum is σ = 5205513992. Its totient is φ = 5205513990.

The previous prime is 5205513977. The next prime is 5205514033. The reversal of 5205513991 is 1993155025.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5205513991 - 2¹⁵ = 5205481223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5205513931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2602756995 + 2602756996.

It is an arithmetic number, because the mean of its divisors is an integer number (2602756996).

Almost surely, 2^5205513991 is an apocalyptic number.

5205513991 is a deficient number, since it is larger than the sum of its proper divisors (1).

5205513991 is an equidigital number, since it uses as much as digits as its factorization.

5205513991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60750, while the sum is 40.

The square root of 5205513991 is about 72149.2480279594. The cubic root of 5205513991 is about 1733.0903577769.

The spelling of 5205513991 in words is "five billion, two hundred five million, five hundred thirteen thousand, nine hundred ninety-one".