9971961 has 8 divisors (see below), whose sum is σ = 13316544. Its totient is φ = 6637680.

The previous prime is 9971959. The next prime is 9971989. The reversal of 9971961 is 1691799.

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

It is not a de Polignac number, because 9971961 - 2¹ = 9971959 is a prime.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9971921) 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 7 ways as a sum of consecutive naturals, for example, 76 + ... + 4466.

It is an arithmetic number, because the mean of its divisors is an integer number (1664568).

Almost surely, 2^9971961 is an apocalyptic number.

It is an amenable number.

9971961 is a deficient number, since it is larger than the sum of its proper divisors (3344583).

9971961 is a wasteful number, since it uses less digits than its factorization.

9971961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5151.

The product of its digits is 30618, while the sum is 42.

The square root of 9971961 is about 3157.8411929671. The cubic root of 9971961 is about 215.2419198635.

The spelling of 9971961 in words is "nine million, nine hundred seventy-one thousand, nine hundred sixty-one".