687499 has 2 divisors, whose sum is σ = 687500. Its totient is φ = 687498.

The previous prime is 687481. The next prime is 687517. The reversal of 687499 is 994786.

It is a balanced prime because it is at equal distance from previous prime (687481) and next prime (687517).

It is a cyclic number.

It is not a de Polignac number, because 687499 - 2¹⁹ = 163211 is a prime.

It is a plaindrome in base 5.

It is not a weakly prime, because it can be changed into another prime (687299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343749 + 343750.

It is an arithmetic number, because the mean of its divisors is an integer number (343750).

2⁶⁸⁷⁴⁹⁹ is an apocalyptic number.

687499 is a deficient number, since it is larger than the sum of its proper divisors (1).

687499 is an equidigital number, since it uses as much as digits as its factorization.

687499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 687499 is about 829.1555945659. The cubic root of 687499 is about 88.2586655910.

The spelling of 687499 in words is "six hundred eighty-seven thousand, four hundred ninety-nine".