687525913 has 4 divisors (see below), whose sum is σ = 717418368. Its totient is φ = 657633460.

The previous prime is 687525907. The next prime is 687525919. The reversal of 687525913 is 319525786.

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 an emirpimes, since its reverse is a distinct semiprime: 319525786 = 2 ⋅159762893.

It is an interprime number because it is at equal distance from previous prime (687525907) and next prime (687525919).

It is a cyclic number.

It is not a de Polignac number, because 687525913 - 2⁹ = 687525401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687525919) 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, 14946193 + ... + 14946238.

It is an arithmetic number, because the mean of its divisors is an integer number (179354592).

Almost surely, 2^687525913 is an apocalyptic number.

It is an amenable number.

687525913 is a deficient number, since it is larger than the sum of its proper divisors (29892455).

687525913 is a wasteful number, since it uses less digits than its factorization.

687525913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29892454.

The product of its digits is 453600, while the sum is 46.

The square root of 687525913 is about 26220.7153411191. The cubic root of 687525913 is about 882.5981724093.

The spelling of 687525913 in words is "six hundred eighty-seven million, five hundred twenty-five thousand, nine hundred thirteen".