231543344987 has 2 divisors, whose sum is σ = 231543344988. Its totient is φ = 231543344986.

The previous prime is 231543344951. The next prime is 231543345029. The reversal of 231543344987 is 789443345132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231543344987 - 2¹⁴ = 231543328603 is a prime.

It is a super-2 number, since 2×231543344987² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231543344287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115771672493 + 115771672494.

It is an arithmetic number, because the mean of its divisors is an integer number (115771672494).

Almost surely, 2^231543344987 is an apocalyptic number.

231543344987 is a deficient number, since it is larger than the sum of its proper divisors (1).

231543344987 is an equidigital number, since it uses as much as digits as its factorization.

231543344987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 53.

The spelling of 231543344987 in words is "two hundred thirty-one billion, five hundred forty-three million, three hundred forty-four thousand, nine hundred eighty-seven".