2231391971 has 2 divisors, whose sum is σ = 2231391972. Its totient is φ = 2231391970.

The previous prime is 2231391941. The next prime is 2231391973. The reversal of 2231391971 is 1791931322.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2231391971 - 2⁶ = 2231391907 is a prime.

It is a super-3 number, since 3×2231391971³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 2231391973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2231391973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115695985 + 1115695986.

It is an arithmetic number, because the mean of its divisors is an integer number (1115695986).

Almost surely, 2^2231391971 is an apocalyptic number.

2231391971 is a deficient number, since it is larger than the sum of its proper divisors (1).

2231391971 is an equidigital number, since it uses as much as digits as its factorization.

2231391971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 38.

The square root of 2231391971 is about 47237.6118257475. The cubic root of 2231391971 is about 1306.7483348306.

The spelling of 2231391971 in words is "two billion, two hundred thirty-one million, three hundred ninety-one thousand, nine hundred seventy-one".