9861251 has 4 divisors (see below), whose sum is σ = 9883104. Its totient is φ = 9839400.

The previous prime is 9861239. The next prime is 9861253. The reversal of 9861251 is 1521689.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1521689 = 13 ⋅117053.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9861251 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9861253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10235 + ... + 11156.

It is an arithmetic number, because the mean of its divisors is an integer number (2470776).

Almost surely, 2^9861251 is an apocalyptic number.

9861251 is a deficient number, since it is larger than the sum of its proper divisors (21853).

9861251 is a wasteful number, since it uses less digits than its factorization.

9861251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21852.

The product of its digits is 4320, while the sum is 32.

The square root of 9861251 is about 3140.2628870845. The cubic root of 9861251 is about 214.4424058816.

The spelling of 9861251 in words is "nine million, eight hundred sixty-one thousand, two hundred fifty-one".