9861625 has 8 divisors (see below), whose sum is σ = 12307464. Its totient is φ = 7889200.

The previous prime is 9861619. The next prime is 9861629. The reversal of 9861625 is 5261689.

It can be written as a sum of positive squares in 4 ways, for example, as 698896 + 9162729 = 836^2 + 3027^2 .

It is not a de Polignac number, because 9861625 - 2¹⁹ = 9337337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9861629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39322 + ... + 39571.

It is an arithmetic number, because the mean of its divisors is an integer number (1538433).

Almost surely, 2^9861625 is an apocalyptic number.

It is an amenable number.

9861625 is a deficient number, since it is larger than the sum of its proper divisors (2445839).

9861625 is an equidigital number, since it uses as much as digits as its factorization.

9861625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78908 (or 78898 counting only the distinct ones).

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

The square root of 9861625 is about 3140.3224356744. The cubic root of 9861625 is about 214.4451168442.

The spelling of 9861625 in words is "nine million, eight hundred sixty-one thousand, six hundred twenty-five".