691371 has 6 divisors (see below), whose sum is σ = 998660. Its totient is φ = 460908.

The previous prime is 691363. The next prime is 691381. The reversal of 691371 is 173196.

691371 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 691371 - 2³ = 691363 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 691371.

It is not an unprimeable number, because it can be changed into a prime (691381) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38401 + ... + 38418.

2⁶⁹¹³⁷¹ is an apocalyptic number.

691371 is a deficient number, since it is larger than the sum of its proper divisors (307289).

691371 is a wasteful number, since it uses less digits than its factorization.

691371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76825 (or 76822 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 691371 is about 831.4872217900. The cubic root of 691371 is about 88.4240466785.

The spelling of 691371 in words is "six hundred ninety-one thousand, three hundred seventy-one".