691913 has 4 divisors (see below), whose sum is σ = 708048. Its totient is φ = 675780.

The previous prime is 691907. The next prime is 691919. The reversal of 691913 is 319196.

691913 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (691907) and next prime (691919).

It is a cyclic number.

It is not a de Polignac number, because 691913 - 2⁴ = 691897 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691913.

It is not an unprimeable number, because it can be changed into a prime (691919) 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, 8003 + ... + 8088.

It is an arithmetic number, because the mean of its divisors is an integer number (177012).

2⁶⁹¹⁹¹³ is an apocalyptic number.

It is an amenable number.

691913 is a deficient number, since it is larger than the sum of its proper divisors (16135).

691913 is a wasteful number, since it uses less digits than its factorization.

691913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16134.

The product of its digits is 1458, while the sum is 29.

The square root of 691913 is about 831.8130799645. The cubic root of 691913 is about 88.4471473075.

It can be divided in two parts, 6 and 91913, that added together give a palindrome (91919).

The spelling of 691913 in words is "six hundred ninety-one thousand, nine hundred thirteen".