2131666231 has 4 divisors (see below), whose sum is σ = 2131758864. Its totient is φ = 2131573600.

The previous prime is 2131666223. The next prime is 2131666249. The reversal of 2131666231 is 1326661312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2131666231 - 2³ = 2131666223 is a prime.

It is a super-2 number, since 2×2131666231² = 9088001840771490722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2131666193 and 2131666202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131666531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17646 + ... + 67636.

It is an arithmetic number, because the mean of its divisors is an integer number (532939716).

Almost surely, 2^2131666231 is an apocalyptic number.

2131666231 is a deficient number, since it is larger than the sum of its proper divisors (92633).

2131666231 is an equidigital number, since it uses as much as digits as its factorization.

2131666231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92632.

The product of its digits is 7776, while the sum is 31.

The square root of 2131666231 is about 46169.9710959407. The cubic root of 2131666231 is about 1286.9837650874.

The spelling of 2131666231 in words is "two billion, one hundred thirty-one million, six hundred sixty-six thousand, two hundred thirty-one".