690169 has 4 divisors (see below), whose sum is σ = 691840. Its totient is φ = 688500.

The previous prime is 690163. The next prime is 690187. The reversal of 690169 is 961096.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 690169 - 2¹³ = 681977 is a prime.

It is a super-2 number, since 2×690169² = 952666497122, which contains 22 as substring.

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

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 690169.

It is not an unprimeable number, because it can be changed into a prime (690163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292 + ... + 1210.

It is an arithmetic number, because the mean of its divisors is an integer number (172960).

2⁶⁹⁰¹⁶⁹ is an apocalyptic number.

It is an amenable number.

690169 is a deficient number, since it is larger than the sum of its proper divisors (1671).

690169 is an equidigital number, since it uses as much as digits as its factorization.

690169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 690169 is about 830.7641061096. The cubic root of 690169 is about 88.3727730214.

The spelling of 690169 in words is "six hundred ninety thousand, one hundred sixty-nine".