523987 has 2 divisors, whose sum is σ = 523988. Its totient is φ = 523986.

The previous prime is 523969. The next prime is 523997. The reversal of 523987 is 789325.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 523987 - 2¹⁵ = 491219 is a prime.

It is not a weakly prime, because it can be changed into another prime (523907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261993 + 261994.

It is an arithmetic number, because the mean of its divisors is an integer number (261994).

2⁵²³⁹⁸⁷ is an apocalyptic number.

523987 is a deficient number, since it is larger than the sum of its proper divisors (1).

523987 is an equidigital number, since it uses as much as digits as its factorization.

523987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 34.

The square root of 523987 is about 723.8694633703. The cubic root of 523987 is about 80.6195130773.

The spelling of 523987 in words is "five hundred twenty-three thousand, nine hundred eighty-seven".