3121040161 has 4 divisors (see below), whose sum is σ = 3132307732. Its totient is φ = 3109772592.

The previous prime is 3121040033. The next prime is 3121040179. The reversal of 3121040161 is 1610401213.

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 1855886400 + 1265153761 = 43080^2 + 35569^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121040161 - 2⁷ = 3121040033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121040861) 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, 5633370 + ... + 5633923.

It is an arithmetic number, because the mean of its divisors is an integer number (783076933).

Almost surely, 2^3121040161 is an apocalyptic number.

It is an amenable number.

3121040161 is a deficient number, since it is larger than the sum of its proper divisors (11267571).

3121040161 is a wasteful number, since it uses less digits than its factorization.

3121040161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11267570.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 3121040161 is about 55866.2703337175. The cubic root of 3121040161 is about 1461.3910806509.

Adding to 3121040161 its reverse (1610401213), we get a palindrome (4731441374).

The spelling of 3121040161 in words is "three billion, one hundred twenty-one million, forty thousand, one hundred sixty-one".