687599249 has 2 divisors, whose sum is σ = 687599250. Its totient is φ = 687599248.

The previous prime is 687599207. The next prime is 687599273. The reversal of 687599249 is 942995786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 530473024 + 157126225 = 23032^2 + 12535^2 .

It is a cyclic number.

It is not a de Polignac number, because 687599249 - 2¹⁶ = 687533713 is a prime.

It is not a weakly prime, because it can be changed into another prime (687599299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343799624 + 343799625.

It is an arithmetic number, because the mean of its divisors is an integer number (343799625).

Almost surely, 2^687599249 is an apocalyptic number.

It is an amenable number.

687599249 is a deficient number, since it is larger than the sum of its proper divisors (1).

687599249 is an equidigital number, since it uses as much as digits as its factorization.

687599249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9797760, while the sum is 59.

The square root of 687599249 is about 26222.1137401240. The cubic root of 687599249 is about 882.6295525203.

The spelling of 687599249 in words is "six hundred eighty-seven million, five hundred ninety-nine thousand, two hundred forty-nine".