11931028161 has 16 divisors (see below), whose sum is σ = 17496240384. Its totient is φ = 7185953664.

The previous prime is 11931028159. The next prime is 11931028163. The reversal of 11931028161 is 16182013911.

It is an interprime number because it is at equal distance from previous prime (11931028159) and next prime (11931028163).

It is not a de Polignac number, because 11931028161 - 2¹ = 11931028159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11931028163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3252676 + ... + 3256341.

It is an arithmetic number, because the mean of its divisors is an integer number (1093515024).

Almost surely, 2^11931028161 is an apocalyptic number.

It is an amenable number.

11931028161 is a deficient number, since it is larger than the sum of its proper divisors (5565212223).

11931028161 is a wasteful number, since it uses less digits than its factorization.

11931028161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6509080.

The product of its (nonzero) digits is 2592, while the sum is 33.

The spelling of 11931028161 in words is "eleven billion, nine hundred thirty-one million, twenty-eight thousand, one hundred sixty-one".