687051 has 12 divisors (see below), whose sum is σ = 1003912. Its totient is φ = 452736.

The previous prime is 687041. The next prime is 687061. The reversal of 687051 is 150786.

687051 = 46³ + 47³ + ... + 51³.

It is an interprime number because it is at equal distance from previous prime (687041) and next prime (687061).

It is not a de Polignac number, because 687051 - 2⁵ = 687019 is a prime.

It is a Duffinian number.

687051 is a lucky number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (687031) 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 in 11 ways as a sum of consecutive naturals, for example, 480 + ... + 1266.

2⁶⁸⁷⁰⁵¹ is an apocalyptic number.

687051 is a deficient number, since it is larger than the sum of its proper divisors (316861).

687051 is a wasteful number, since it uses less digits than its factorization.

687051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890 (or 887 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 687051 is about 828.8853961797. The cubic root of 687051 is about 88.2394905455.

The spelling of 687051 in words is "six hundred eighty-seven thousand, fifty-one".