9601921861 has 24 divisors (see below), whose sum is σ = 12049815960. Its totient is φ = 7599900672.

The previous prime is 9601921841. The next prime is 9601921867. The reversal of 9601921861 is 1681291069.

It can be written as a sum of positive squares in 4 ways, for example, as 3270696100 + 6331225761 = 57190^2 + 79569^2 .

It is not a de Polignac number, because 9601921861 - 2⁹ = 9601921349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9601921867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64596 + ... + 152893.

It is an arithmetic number, because the mean of its divisors is an integer number (502075665).

Almost surely, 2^9601921861 is an apocalyptic number.

It is an amenable number.

9601921861 is a deficient number, since it is larger than the sum of its proper divisors (2447894099).

9601921861 is a wasteful number, since it uses less digits than its factorization.

9601921861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217573 (or 217566 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 43.

The square root of 9601921861 is about 97989.3966763751. The cubic root of 9601921861 is about 2125.4589540452.

The spelling of 9601921861 in words is "nine billion, six hundred one million, nine hundred twenty-one thousand, eight hundred sixty-one".