133669 has 2 divisors, whose sum is σ = 133670. Its totient is φ = 133668.
The previous prime is 133657. The next prime is 133673. The reversal of 133669 is 966331.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 68644 + 65025 = 262^2 + 255^2 .
It is a cyclic number.
It is not a de Polignac number, because 133669 - 27 = 133541 is a prime.
It is a super-2 number, since 2×1336692 = 35734803122, which contains 22 as substring.
133669 is a lucky number.
It is a plaindrome in base 10.
It is a nialpdrome in base 12.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (133649) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66834 + 66835.
It is an arithmetic number, because the mean of its divisors is an integer number (66835).
2133669 is an apocalyptic number.
It is an amenable number.
133669 is a deficient number, since it is larger than the sum of its proper divisors (1).
133669 is an equidigital number, since it uses as much as digits as its factorization.
133669 is an evil number, because the sum of its binary digits is even.
The product of its digits is 2916, while the sum is 28.
The square root of 133669 is about 365.6077132666. The cubic root of 133669 is about 51.1301303229.
It can be divided in two parts, 1 and 33669, that added together give a triangular number (33670 = T259).
The spelling of 133669 in words is "one hundred thirty-three thousand, six hundred sixty-nine".
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