231687853 has 2 divisors, whose sum is σ = 231687854. Its totient is φ = 231687852.

The previous prime is 231687851. The next prime is 231687871. The reversal of 231687853 is 358786132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168039369 + 63648484 = 12963^2 + 7978^2 .

It is a cyclic number.

It is not a de Polignac number, because 231687853 - 2¹ = 231687851 is a prime.

It is a super-2 number, since 2×231687853² = 107358522455499218, which contains 22 as substring.

Together with 231687851, 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 (231687851) 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, 115843926 + 115843927.

It is an arithmetic number, because the mean of its divisors is an integer number (115843927).

Almost surely, 2^231687853 is an apocalyptic number.

It is an amenable number.

231687853 is a deficient number, since it is larger than the sum of its proper divisors (1).

231687853 is an equidigital number, since it uses as much as digits as its factorization.

231687853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 43.

The square root of 231687853 is about 15221.2960354892. The cubic root of 231687853 is about 614.1876625775.

The spelling of 231687853 in words is "two hundred thirty-one million, six hundred eighty-seven thousand, eight hundred fifty-three".