9409639961 has 4 divisors (see below), whose sum is σ = 9963148212. Its totient is φ = 8856131712.

The previous prime is 9409639891. The next prime is 9409639979. The reversal of 9409639961 is 1699369049.

9409639961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4013856025 + 5395783936 = 63355^2 + 73456^2 .

It is a cyclic number.

It is not a de Polignac number, because 9409639961 - 2¹⁰ = 9409638937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9409639897 and 9409639906.

It is not an unprimeable number, because it can be changed into a prime (9409639861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276754100 + ... + 276754133.

It is an arithmetic number, because the mean of its divisors is an integer number (2490787053).

Almost surely, 2^9409639961 is an apocalyptic number.

It is an amenable number.

9409639961 is a deficient number, since it is larger than the sum of its proper divisors (553508251).

9409639961 is a wasteful number, since it uses less digits than its factorization.

9409639961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553508250.

The product of its (nonzero) digits is 2834352, while the sum is 56.

The square root of 9409639961 is about 97003.2987119510. The cubic root of 9409639961 is about 2111.1754911698.

The spelling of 9409639961 in words is "nine billion, four hundred nine million, six hundred thirty-nine thousand, nine hundred sixty-one".