687098513 has 2 divisors, whose sum is σ = 687098514. Its totient is φ = 687098512.

The previous prime is 687098509. The next prime is 687098521. The reversal of 687098513 is 315890786.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 455054224 + 232044289 = 21332^2 + 15233^2 .

It is a cyclic number.

It is not a de Polignac number, because 687098513 - 2² = 687098509 is a prime.

It is a super-2 number, since 2×687098513² = 944208733133622338, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (687098543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343549256 + 343549257.

It is an arithmetic number, because the mean of its divisors is an integer number (343549257).

Almost surely, 2^687098513 is an apocalyptic number.

It is an amenable number.

687098513 is a deficient number, since it is larger than the sum of its proper divisors (1).

687098513 is an equidigital number, since it uses as much as digits as its factorization.

687098513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 687098513 is about 26212.5640294878. The cubic root of 687098513 is about 882.4152456544.

The spelling of 687098513 in words is "six hundred eighty-seven million, ninety-eight thousand, five hundred thirteen".