5198561281 has 2 divisors, whose sum is σ = 5198561282. Its totient is φ = 5198561280.

The previous prime is 5198561243. The next prime is 5198561287. The reversal of 5198561281 is 1821658915.

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., 4911767056 + 286794225 = 70084^2 + 16935^2 .

It is a cyclic number.

It is not a de Polignac number, because 5198561281 - 2⁹ = 5198560769 is a prime.

It is a super-2 number, since 2×5198561281² = 54050078784624721922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5198561287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2599280640 + 2599280641.

It is an arithmetic number, because the mean of its divisors is an integer number (2599280641).

Almost surely, 2^5198561281 is an apocalyptic number.

It is an amenable number.

5198561281 is a deficient number, since it is larger than the sum of its proper divisors (1).

5198561281 is an equidigital number, since it uses as much as digits as its factorization.

5198561281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 46.

The square root of 5198561281 is about 72101.0490977767. The cubic root of 5198561281 is about 1732.3184171414.

The spelling of 5198561281 in words is "five billion, one hundred ninety-eight million, five hundred sixty-one thousand, two hundred eighty-one".