9951861 has 8 divisors (see below), whose sum is σ = 13284000. Its totient is φ = 6627152.

The previous prime is 9951841. The next prime is 9951869. The reversal of 9951861 is 1681599.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9951861 - 2⁵ = 9951829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9951869) 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, 3391 + ... + 5603.

It is an arithmetic number, because the mean of its divisors is an integer number (1660500).

Almost surely, 2^9951861 is an apocalyptic number.

It is an amenable number.

9951861 is a deficient number, since it is larger than the sum of its proper divisors (3332139).

9951861 is a wasteful number, since it uses less digits than its factorization.

9951861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3715.

The product of its digits is 19440, while the sum is 39.

The square root of 9951861 is about 3154.6570336567. The cubic root of 9951861 is about 215.0972050088.

The spelling of 9951861 in words is "nine million, nine hundred fifty-one thousand, eight hundred sixty-one".