691133 has 4 divisors (see below), whose sum is σ = 694908. Its totient is φ = 687360.

The previous prime is 691129. The next prime is 691147. The reversal of 691133 is 331196.

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

It can be written as a sum of positive squares in 2 ways, for example, as 407044 + 284089 = 638^2 + 533^2 .

It is a cyclic number.

It is not a de Polignac number, because 691133 - 2² = 691129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 691099 and 691108.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691133.

It is not an unprimeable number, because it can be changed into a prime (691153) 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, 1598 + ... + 1983.

It is an arithmetic number, because the mean of its divisors is an integer number (173727).

2⁶⁹¹¹³³ is an apocalyptic number.

It is an amenable number.

691133 is a deficient number, since it is larger than the sum of its proper divisors (3775).

691133 is a wasteful number, since it uses less digits than its factorization.

691133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3774.

The product of its digits is 486, while the sum is 23.

The square root of 691133 is about 831.3440924190. The cubic root of 691133 is about 88.4138990451.

The spelling of 691133 in words is "six hundred ninety-one thousand, one hundred thirty-three".