687561351 has 4 divisors (see below), whose sum is σ = 916748472. Its totient is φ = 458374232.

The previous prime is 687561313. The next prime is 687561353. The reversal of 687561351 is 153165786.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 687561351 - 2¹⁰ = 687560327 is a prime.

It is a super-2 number, since 2×687561351² = 945481222777890402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687561353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114593556 + ... + 114593561.

It is an arithmetic number, because the mean of its divisors is an integer number (229187118).

Almost surely, 2^687561351 is an apocalyptic number.

687561351 is a deficient number, since it is larger than the sum of its proper divisors (229187121).

687561351 is a wasteful number, since it uses less digits than its factorization.

687561351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229187120.

The product of its digits is 151200, while the sum is 42.

The square root of 687561351 is about 26221.3910958210. The cubic root of 687561351 is about 882.6133364325.

It can be divided in two parts, 68756 and 1351, that added together give a palindrome (70107).

The spelling of 687561351 in words is "six hundred eighty-seven million, five hundred sixty-one thousand, three hundred fifty-one".