523669 has 2 divisors, whose sum is σ = 523670. Its totient is φ = 523668.

The previous prime is 523667. The next prime is 523673. The reversal of 523669 is 966325.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 439569 + 84100 = 663^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 523669 - 2¹ = 523667 is a prime.

It is a super-2 number, since 2×523669² = 548458443122, which contains 22 as substring.

Together with 523667, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 523669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (523667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261834 + 261835.

It is an arithmetic number, because the mean of its divisors is an integer number (261835).

2⁵²³⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

523669 is a deficient number, since it is larger than the sum of its proper divisors (1).

523669 is an equidigital number, since it uses as much as digits as its factorization.

523669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 31.

The square root of 523669 is about 723.6497771713. The cubic root of 523669 is about 80.6032008449.

It can be divided in two parts, 52 and 3669, that added together give a square (3721 = 61²).

The spelling of 523669 in words is "five hundred twenty-three thousand, six hundred sixty-nine".