690125 has 8 divisors (see below), whose sum is σ = 861432. Its totient is φ = 552000.

The previous prime is 690119. The next prime is 690127. The reversal of 690125 is 521096.

It can be written as a sum of positive squares in 4 ways, for example, as 70756 + 619369 = 266^2 + 787^2 .

It is not a de Polignac number, because 690125 - 2⁸ = 689869 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 690125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690127) 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, 2636 + ... + 2885.

It is an arithmetic number, because the mean of its divisors is an integer number (107679).

2⁶⁹⁰¹²⁵ is an apocalyptic number.

It is an amenable number.

690125 is a deficient number, since it is larger than the sum of its proper divisors (171307).

690125 is an equidigital number, since it uses as much as digits as its factorization.

690125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5536 (or 5526 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 690125 is about 830.7376240426. The cubic root of 690125 is about 88.3708949863.

The spelling of 690125 in words is "six hundred ninety thousand, one hundred twenty-five".