9961200961 has 4 divisors (see below), whose sum is σ = 10204157124. Its totient is φ = 9718244800.

The previous prime is 9961200959. The next prime is 9961200971. The reversal of 9961200961 is 1690021699.

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 963729936 + 8997471025 = 31044^2 + 94855^2 .

It is a cyclic number.

It is not a de Polignac number, because 9961200961 - 2¹ = 9961200959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9961200971) 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, 121478020 + ... + 121478101.

It is an arithmetic number, because the mean of its divisors is an integer number (2551039281).

Almost surely, 2^9961200961 is an apocalyptic number.

It is an amenable number.

9961200961 is a deficient number, since it is larger than the sum of its proper divisors (242956163).

9961200961 is a wasteful number, since it uses less digits than its factorization.

9961200961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242956162.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 9961200961 is about 99805.8162683919. The cubic root of 9961200961 is about 2151.6447454905.

The spelling of 9961200961 in words is "nine billion, nine hundred sixty-one million, two hundred thousand, nine hundred sixty-one".