1231240271 has 2 divisors, whose sum is σ = 1231240272. Its totient is φ = 1231240270.

The previous prime is 1231240253. The next prime is 1231240313. The reversal of 1231240271 is 1720421321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231240271 - 2⁶ = 1231240207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231240771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615620135 + 615620136.

It is an arithmetic number, because the mean of its divisors is an integer number (615620136).

Almost surely, 2^1231240271 is an apocalyptic number.

1231240271 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231240271 is an equidigital number, since it uses as much as digits as its factorization.

1231240271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1231240271 is about 35089.0334862618. The cubic root of 1231240271 is about 1071.8012781263.

Adding to 1231240271 its reverse (1720421321), we get a palindrome (2951661592).

The spelling of 1231240271 in words is "one billion, two hundred thirty-one million, two hundred forty thousand, two hundred seventy-one".