691159 has 4 divisors (see below), whose sum is σ = 789904. Its totient is φ = 592416.

The previous prime is 691153. The next prime is 691181. The reversal of 691159 is 951196.

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 691159 - 2³ = 691151 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 691159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691151) 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, 49362 + ... + 49375.

It is an arithmetic number, because the mean of its divisors is an integer number (197476).

2⁶⁹¹¹⁵⁹ is an apocalyptic number.

691159 is a deficient number, since it is larger than the sum of its proper divisors (98745).

691159 is an equidigital number, since it uses as much as digits as its factorization.

691159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98744.

The product of its digits is 2430, while the sum is 31.

The square root of 691159 is about 831.3597295996. The cubic root of 691159 is about 88.4150077234.

The spelling of 691159 in words is "six hundred ninety-one thousand, one hundred fifty-nine".