684525487 has 2 divisors, whose sum is σ = 684525488. Its totient is φ = 684525486.

The previous prime is 684525481. The next prime is 684525503. The reversal of 684525487 is 784525486.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684525487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 684525487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684525481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342262743 + 342262744.

It is an arithmetic number, because the mean of its divisors is an integer number (342262744).

Almost surely, 2^684525487 is an apocalyptic number.

684525487 is a deficient number, since it is larger than the sum of its proper divisors (1).

684525487 is an equidigital number, since it uses as much as digits as its factorization.

684525487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2150400, while the sum is 49.

The square root of 684525487 is about 26163.4379812746. The cubic root of 684525487 is about 881.3123870995.

Subtracting 684525487 from its reverse (784525486), we obtain a palindrome (99999999).

The spelling of 684525487 in words is "six hundred eighty-four million, five hundred twenty-five thousand, four hundred eighty-seven".