2131223191 has 2 divisors, whose sum is σ = 2131223192. Its totient is φ = 2131223190.

The previous prime is 2131223189. The next prime is 2131223197. The reversal of 2131223191 is 1913221312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2131223191 - 2¹ = 2131223189 is a prime.

It is a super-2 number, since 2×2131223191² = 9084224579712444962, which contains 22 as substring.

Together with 2131223189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131223197) 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 as a sum of consecutive naturals, namely, 1065611595 + 1065611596.

It is an arithmetic number, because the mean of its divisors is an integer number (1065611596).

Almost surely, 2^2131223191 is an apocalyptic number.

2131223191 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131223191 is an equidigital number, since it uses as much as digits as its factorization.

2131223191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 25.

The square root of 2131223191 is about 46165.1729228864. The cubic root of 2131223191 is about 1286.8945977832.

The spelling of 2131223191 in words is "two billion, one hundred thirty-one million, two hundred twenty-three thousand, one hundred ninety-one".