9956651 has 4 divisors (see below), whose sum is σ = 9966600. Its totient is φ = 9946704.

The previous prime is 9956641. The next prime is 9956699. The reversal of 9956651 is 1566599.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1566599 = 23 ⋅68113.

It is a cyclic number.

It is not a de Polignac number, because 9956651 - 2⁶ = 9956587 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9956599 and 9956608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9956641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3281 + ... + 5538.

It is an arithmetic number, because the mean of its divisors is an integer number (2491650).

Almost surely, 2^9956651 is an apocalyptic number.

9956651 is a deficient number, since it is larger than the sum of its proper divisors (9949).

9956651 is a wasteful number, since it uses less digits than its factorization.

9956651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9948.

The product of its digits is 72900, while the sum is 41.

The square root of 9956651 is about 3155.4161373740. The cubic root of 9956651 is about 215.1317094549.

The spelling of 9956651 in words is "nine million, nine hundred fifty-six thousand, six hundred fifty-one".