691093 has 4 divisors (see below), whose sum is σ = 744268. Its totient is φ = 637920.

The previous prime is 691079. The next prime is 691109. The reversal of 691093 is 390196.

It is a happy number.

691093 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 272484 + 418609 = 522^2 + 647^2 .

It is a cyclic number.

It is not a de Polignac number, because 691093 - 2¹³ = 682901 is a prime.

It is a Duffinian number.

691093 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691063) 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, 26568 + ... + 26593.

It is an arithmetic number, because the mean of its divisors is an integer number (186067).

2⁶⁹¹⁰⁹³ is an apocalyptic number.

It is an amenable number.

691093 is a deficient number, since it is larger than the sum of its proper divisors (53175).

691093 is a wasteful number, since it uses less digits than its factorization.

691093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53174.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 691093 is about 831.3200346437. The cubic root of 691093 is about 88.4121933318.

The spelling of 691093 in words is "six hundred ninety-one thousand, ninety-three".