9649981 has 8 divisors (see below), whose sum is σ = 10706400. Its totient is φ = 8623440.

The previous prime is 9649979. The next prime is 9649987. The reversal of 9649981 is 1899469.

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

It is not a de Polignac number, because 9649981 - 2¹ = 9649979 is a prime.

It is a super-2 number, since 2×9649981² = 186244266600722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9649987) 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, 6786 + ... + 8083.

It is an arithmetic number, because the mean of its divisors is an integer number (1338300).

Almost surely, 2^9649981 is an apocalyptic number.

It is an amenable number.

9649981 is a deficient number, since it is larger than the sum of its proper divisors (1056419).

9649981 is a wasteful number, since it uses less digits than its factorization.

9649981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14939.

The product of its digits is 139968, while the sum is 46.

The square root of 9649981 is about 3106.4418552421. The cubic root of 9649981 is about 212.8999140383.

It can be divided in two parts, 96499 and 81, that added together give a triangular number (96580 = T₄₃₉).

The spelling of 9649981 in words is "nine million, six hundred forty-nine thousand, nine hundred eighty-one".