687137 has 4 divisors (see below), whose sum is σ = 749616. Its totient is φ = 624660.

The previous prime is 687131. The next prime is 687139. The reversal of 687137 is 731786.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 687137 - 2⁴ = 687121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687131) 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, 31223 + ... + 31244.

It is an arithmetic number, because the mean of its divisors is an integer number (187404).

2⁶⁸⁷¹³⁷ is an apocalyptic number.

It is an amenable number.

687137 is a deficient number, since it is larger than the sum of its proper divisors (62479).

687137 is a wasteful number, since it uses less digits than its factorization.

687137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62478.

The product of its digits is 7056, while the sum is 32.

The square root of 687137 is about 828.9372714506. The cubic root of 687137 is about 88.2431721158.

The spelling of 687137 in words is "six hundred eighty-seven thousand, one hundred thirty-seven".