691477 has 4 divisors (see below), whose sum is σ = 695520. Its totient is φ = 687436.

The previous prime is 691463. The next prime is 691489. The reversal of 691477 is 774196.

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 691477 - 2⁷ = 691349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691877) 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, 1753 + ... + 2110.

It is an arithmetic number, because the mean of its divisors is an integer number (173880).

2⁶⁹¹⁴⁷⁷ is an apocalyptic number.

It is an amenable number.

691477 is a deficient number, since it is larger than the sum of its proper divisors (4043).

691477 is a wasteful number, since it uses less digits than its factorization.

691477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4042.

The product of its digits is 10584, while the sum is 34.

The square root of 691477 is about 831.5509605550. The cubic root of 691477 is about 88.4285654632.

The spelling of 691477 in words is "six hundred ninety-one thousand, four hundred seventy-seven".