9861513220 has 48 divisors (see below), whose sum is σ = 23071250160. Its totient is φ = 3515613696.

The previous prime is 9861513197. The next prime is 9861513253. The reversal of 9861513220 is 223151689.

It can be written as a sum of positive squares in 8 ways, for example, as 109160704 + 9752352516 = 10448^2 + 98754^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 9861513220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 646407 + ... + 661486.

It is an arithmetic number, because the mean of its divisors is an integer number (480651045).

Almost surely, 2^9861513220 is an apocalyptic number.

It is an amenable number.

9861513220 is an abundant number, since it is smaller than the sum of its proper divisors (13209736940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9861513220 is a wasteful number, since it uses less digits than its factorization.

9861513220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307944 (or 1307942 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 9861513220 is about 99305.1520315034. The cubic root of 9861513220 is about 2144.4430660700.

The spelling of 9861513220 in words is "nine billion, eight hundred sixty-one million, five hundred thirteen thousand, two hundred twenty".