691125 has 32 divisors (see below), whose sum is σ = 1223040. Its totient is φ = 345600.

The previous prime is 691121. The next prime is 691129. The reversal of 691125 is 521196.

It is an interprime number because it is at equal distance from previous prime (691121) and next prime (691129).

It is not a de Polignac number, because 691125 - 2² = 691121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 691095 and 691104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691121) 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 31 ways as a sum of consecutive naturals, for example, 7077 + ... + 7173.

It is an arithmetic number, because the mean of its divisors is an integer number (38220).

2⁶⁹¹¹²⁵ is an apocalyptic number.

It is an amenable number.

691125 is a deficient number, since it is larger than the sum of its proper divisors (531915).

691125 is a wasteful number, since it uses less digits than its factorization.

691125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 124 counting only the distinct ones).

The product of its digits is 540, while the sum is 24.

The square root of 691125 is about 831.3392809196. The cubic root of 691125 is about 88.4135579077.

The spelling of 691125 in words is "six hundred ninety-one thousand, one hundred twenty-five".