691471 has 4 divisors (see below), whose sum is σ = 754344. Its totient is φ = 628600.

The previous prime is 691463. The next prime is 691489. The reversal of 691471 is 174196.

691471 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 is a cyclic number.

It is not a de Polignac number, because 691471 - 2³ = 691463 is a prime.

It is a super-3 number, since 3×691471³ = 991843534901640333, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691451) 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, 31420 + ... + 31441.

It is an arithmetic number, because the mean of its divisors is an integer number (188586).

2⁶⁹¹⁴⁷¹ is an apocalyptic number.

691471 is a deficient number, since it is larger than the sum of its proper divisors (62873).

691471 is a wasteful number, since it uses less digits than its factorization.

691471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62872.

The product of its digits is 1512, while the sum is 28.

The square root of 691471 is about 831.5473528309. The cubic root of 691471 is about 88.4283096952.

It can be divided in two parts, 69 and 1471, that added together give a triangular number (1540 = T₅₅).

The spelling of 691471 in words is "six hundred ninety-one thousand, four hundred seventy-one".