130661 has 4 divisors (see below), whose sum is σ = 131532. Its totient is φ = 129792.
The previous prime is 130657. The next prime is 130681. The reversal of 130661 is 166031.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.
It can be written as a sum of positive squares in 2 ways, for example, as 93025 + 37636 = 305^2 + 194^2 .
It is a cyclic number.
It is not a de Polignac number, because 130661 - 22 = 130657 is a prime.
It is a Duffinian number.
It is a Curzon number.
It is a plaindrome in base 14 and base 15.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (130621) 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, 146 + ... + 531.
It is an arithmetic number, because the mean of its divisors is an integer number (32883).
2130661 is an apocalyptic number.
It is an amenable number.
130661 is a deficient number, since it is larger than the sum of its proper divisors (871).
130661 is an equidigital number, since it uses as much as digits as its factorization.
130661 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 870.
The product of its (nonzero) digits is 108, while the sum is 17.
The square root of 130661 is about 361.4706073805. The cubic root of 130661 is about 50.7436838459.
Adding to 130661 its reverse (166031), we get a palindrome (296692).
The spelling of 130661 in words is "one hundred thirty thousand, six hundred sixty-one".
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