9581900161 has 4 divisors (see below), whose sum is σ = 9592215300. Its totient is φ = 9571585024.

The previous prime is 9581900117. The next prime is 9581900177. The reversal of 9581900161 is 1610091859.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1610091859 = 397 ⋅4055647.

It can be written as a sum of positive squares in 2 ways, for example, as 215531761 + 9366368400 = 14681^2 + 96780^2 .

It is a cyclic number.

It is not a de Polignac number, because 9581900161 - 2⁷ = 9581900033 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9581960161) 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, 5156176 + ... + 5158033.

It is an arithmetic number, because the mean of its divisors is an integer number (2398053825).

Almost surely, 2^9581900161 is an apocalyptic number.

It is an amenable number.

9581900161 is a deficient number, since it is larger than the sum of its proper divisors (10315139).

9581900161 is a wasteful number, since it uses less digits than its factorization.

9581900161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10315138.

The product of its (nonzero) digits is 19440, while the sum is 40.

The square root of 9581900161 is about 97887.1807797119. The cubic root of 9581900161 is about 2123.9806071439.

The spelling of 9581900161 in words is "nine billion, five hundred eighty-one million, nine hundred thousand, one hundred sixty-one".