687751513 has 4 divisors (see below), whose sum is σ = 687806080. Its totient is φ = 687696948.

The previous prime is 687751499. The next prime is 687751549. The reversal of 687751513 is 315157786.

687751513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 687751513 - 2¹³ = 687743321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 687751513.

It is not an unprimeable number, because it can be changed into a prime (687751573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2356 + ... + 37162.

It is an arithmetic number, because the mean of its divisors is an integer number (171951520).

Almost surely, 2^687751513 is an apocalyptic number.

It is an amenable number.

687751513 is a deficient number, since it is larger than the sum of its proper divisors (54567).

687751513 is a wasteful number, since it uses less digits than its factorization.

687751513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54566.

The product of its digits is 176400, while the sum is 43.

The square root of 687751513 is about 26225.0169304044. The cubic root of 687751513 is about 882.6946984065.

The spelling of 687751513 in words is "six hundred eighty-seven million, seven hundred fifty-one thousand, five hundred thirteen".