691161 has 4 divisors (see below), whose sum is σ = 921552. Its totient is φ = 460772.

The previous prime is 691153. The next prime is 691181. The reversal of 691161 is 161196.

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 691161 - 2³ = 691153 is a prime.

It is a D-number.

691161 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691161.

It is not an unprimeable number, because it can be changed into a prime (691111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115191 + ... + 115196.

It is an arithmetic number, because the mean of its divisors is an integer number (230388).

2⁶⁹¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

691161 is a deficient number, since it is larger than the sum of its proper divisors (230391).

691161 is a wasteful number, since it uses less digits than its factorization.

691161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230390.

The product of its digits is 324, while the sum is 24.

The square root of 691161 is about 831.3609324475. The cubic root of 691161 is about 88.4150930052.

The spelling of 691161 in words is "six hundred ninety-one thousand, one hundred sixty-one".