691054 has 16 divisors (see below), whose sum is σ = 1276128. Its totient is φ = 273312.

The previous prime is 691051. The next prime is 691063. The reversal of 691054 is 450196.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691051) 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 7 ways as a sum of consecutive naturals, for example, 1717 + ... + 2080.

It is an arithmetic number, because the mean of its divisors is an integer number (79758).

2⁶⁹¹⁰⁵⁴ is an apocalyptic number.

691054 is a deficient number, since it is larger than the sum of its proper divisors (585074).

691054 is a wasteful number, since it uses less digits than its factorization.

691054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3819.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 691054 is about 831.2965776424. The cubic root of 691054 is about 88.4105301980.

The spelling of 691054 in words is "six hundred ninety-one thousand, fifty-four".