231306487 has 2 divisors, whose sum is σ = 231306488. Its totient is φ = 231306486.

The previous prime is 231306479. The next prime is 231306533. The reversal of 231306487 is 784603132.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231306487 - 2³ = 231306479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231306457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115653243 + 115653244.

It is an arithmetic number, because the mean of its divisors is an integer number (115653244).

Almost surely, 2^231306487 is an apocalyptic number.

231306487 is a deficient number, since it is larger than the sum of its proper divisors (1).

231306487 is an equidigital number, since it uses as much as digits as its factorization.

231306487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 231306487 is about 15208.7634934599. The cubic root of 231306487 is about 613.8504863240.

The spelling of 231306487 in words is "two hundred thirty-one million, three hundred six thousand, four hundred eighty-seven".