2131201165 has 16 divisors (see below), whose sum is σ = 2578559616. Its totient is φ = 1690920000.

The previous prime is 2131201157. The next prime is 2131201211. The reversal of 2131201165 is 5611021312.

It is a happy number.

It is not a de Polignac number, because 2131201165 - 2³ = 2131201157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 551490 + ... + 555340.

It is an arithmetic number, because the mean of its divisors is an integer number (161159976).

Almost surely, 2^2131201165 is an apocalyptic number.

It is an amenable number.

2131201165 is a deficient number, since it is larger than the sum of its proper divisors (447358451).

2131201165 is a wasteful number, since it uses less digits than its factorization.

2131201165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4740.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 2131201165 is about 46164.9343658149. The cubic root of 2131201165 is about 1286.8901644547.

Adding to 2131201165 its reverse (5611021312), we get a palindrome (7742222477).

The spelling of 2131201165 in words is "two billion, one hundred thirty-one million, two hundred one thousand, one hundred sixty-five".