691053 has 16 divisors (see below), whose sum is σ = 1030656. Its totient is φ = 408240.

The previous prime is 691051. The next prime is 691063. The reversal of 691053 is 350196.

It is not a de Polignac number, because 691053 - 2¹ = 691051 is a prime.

It is a Curzon number.

It is a nialpdrome in base 11.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691053.

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 15 ways as a sum of consecutive naturals, for example, 1176 + ... + 1662.

It is an arithmetic number, because the mean of its divisors is an integer number (64416).

2⁶⁹¹⁰⁵³ is an apocalyptic number.

It is an amenable number.

691053 is a deficient number, since it is larger than the sum of its proper divisors (339603).

691053 is a wasteful number, since it uses less digits than its factorization.

691053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 691053 is about 831.2959761721. The cubic root of 691053 is about 88.4104875527.

The spelling of 691053 in words is "six hundred ninety-one thousand, fifty-three".