691059 has 4 divisors (see below), whose sum is σ = 921416. Its totient is φ = 460704.

The previous prime is 691051. The next prime is 691063. The reversal of 691059 is 950196.

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

It is not a de Polignac number, because 691059 - 2³ = 691051 is a prime.

It is a D-number.

It is a Duffinian number.

691059 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (691051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115174 + ... + 115179.

It is an arithmetic number, because the mean of its divisors is an integer number (230354).

2⁶⁹¹⁰⁵⁹ is an apocalyptic number.

691059 is a deficient number, since it is larger than the sum of its proper divisors (230357).

691059 is a wasteful number, since it uses less digits than its factorization.

691059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230356.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 691059 is about 831.2995849873. The cubic root of 691059 is about 88.4107434238.

It can be divided in two parts, 69 and 1059, that added together give a triangular number (1128 = T₄₇).

The spelling of 691059 in words is "six hundred ninety-one thousand, fifty-nine".