9861513197 has 2 divisors, whose sum is σ = 9861513198. Its totient is φ = 9861513196.

The previous prime is 9861513131. The next prime is 9861513253. The reversal of 9861513197 is 7913151689.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7960029961 + 1901483236 = 89219^2 + 43606^2 .

It is an emirp because it is prime and its reverse (7913151689) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9861513197 - 2¹⁰ = 9861512173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9861513107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4930756598 + 4930756599.

It is an arithmetic number, because the mean of its divisors is an integer number (4930756599).

Almost surely, 2^9861513197 is an apocalyptic number.

It is an amenable number.

9861513197 is a deficient number, since it is larger than the sum of its proper divisors (1).

9861513197 is an equidigital number, since it uses as much as digits as its factorization.

9861513197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 50.

The square root of 9861513197 is about 99305.1519156987. The cubic root of 9861513197 is about 2144.4430644028.

The spelling of 9861513197 in words is "nine billion, eight hundred sixty-one million, five hundred thirteen thousand, one hundred ninety-seven".