5198168581 has 2 divisors, whose sum is σ = 5198168582. Its totient is φ = 5198168580.

The previous prime is 5198168551. The next prime is 5198168587. The reversal of 5198168581 is 1858618915.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5174500356 + 23668225 = 71934^2 + 4865^2 .

It is a cyclic number.

It is not a de Polignac number, because 5198168581 - 2¹³ = 5198160389 is a prime.

It is a super-2 number, since 2×5198168581² = 54041913192991107122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5198168587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2599084290 + 2599084291.

It is an arithmetic number, because the mean of its divisors is an integer number (2599084291).

Almost surely, 2^5198168581 is an apocalyptic number.

It is an amenable number.

5198168581 is a deficient number, since it is larger than the sum of its proper divisors (1).

5198168581 is an equidigital number, since it uses as much as digits as its factorization.

5198168581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691200, while the sum is 52.

The square root of 5198168581 is about 72098.3257850000. The cubic root of 5198168581 is about 1732.2747961896.

The spelling of 5198168581 in words is "five billion, one hundred ninety-eight million, one hundred sixty-eight thousand, five hundred eighty-one".