231878611 has 2 divisors, whose sum is σ = 231878612. Its totient is φ = 231878610.

The previous prime is 231878609. The next prime is 231878627. The reversal of 231878611 is 116878132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231878611 - 2¹ = 231878609 is a prime.

Together with 231878609, 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 (231878681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115939305 + 115939306.

It is an arithmetic number, because the mean of its divisors is an integer number (115939306).

Almost surely, 2^231878611 is an apocalyptic number.

231878611 is a deficient number, since it is larger than the sum of its proper divisors (1).

231878611 is an equidigital number, since it uses as much as digits as its factorization.

231878611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 37.

The square root of 231878611 is about 15227.5609012080. The cubic root of 231878611 is about 614.3561782029.

The spelling of 231878611 in words is "two hundred thirty-one million, eight hundred seventy-eight thousand, six hundred eleven".