691013 has 4 divisors (see below), whose sum is σ = 699840. Its totient is φ = 682188.

The previous prime is 691001. The next prime is 691037. The reversal of 691013 is 310196.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 691013 - 2⁴ = 690997 is a prime.

It is a Duffinian number.

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 691013.

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, 4295 + ... + 4452.

It is an arithmetic number, because the mean of its divisors is an integer number (174960).

2⁶⁹¹⁰¹³ is an apocalyptic number.

It is an amenable number.

691013 is a deficient number, since it is larger than the sum of its proper divisors (8827).

691013 is an equidigital number, since it uses as much as digits as its factorization.

691013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8826.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 691013 is about 831.2719170043. The cubic root of 691013 is about 88.4087817078.

It can be divided in two parts, 6 and 91013, that added together give a palindrome (91019).

The spelling of 691013 in words is "six hundred ninety-one thousand, thirteen".