231261143 has 2 divisors, whose sum is σ = 231261144. Its totient is φ = 231261142.

The previous prime is 231261139. The next prime is 231261227. The reversal of 231261143 is 341162132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231261143 - 2² = 231261139 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231263143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115630571 + 115630572.

It is an arithmetic number, because the mean of its divisors is an integer number (115630572).

Almost surely, 2^231261143 is an apocalyptic number.

231261143 is a deficient number, since it is larger than the sum of its proper divisors (1).

231261143 is an equidigital number, since it uses as much as digits as its factorization.

231261143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 231261143 is about 15207.2727009152. The cubic root of 231261143 is about 613.8103717905.

The spelling of 231261143 in words is "two hundred thirty-one million, two hundred sixty-one thousand, one hundred forty-three".