131535 has 24 divisors (see below), whose sum is σ = 237120. Its totient is φ = 67392.
The previous prime is 131519. The next prime is 131543. The reversal of 131535 is 535131.
It is a happy number.
131535 is a `hidden beast` number, since 131 + 535 = 666.
It is not a de Polignac number, because 131535 - 24 = 131519 is a prime.
It is a nude number because it is divisible by every one of its digits.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1626 + ... + 1704.
It is an arithmetic number, because the mean of its divisors is an integer number (9880).
2131535 is an apocalyptic number.
131535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.
131535 is a deficient number, since it is larger than the sum of its proper divisors (105585).
131535 is a wasteful number, since it uses less digits than its factorization.
131535 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 127 (or 124 counting only the distinct ones).
The product of its digits is 225, while the sum is 18.
The square root of 131535 is about 362.6775427291. The cubic root of 131535 is about 50.8565751165.
Adding to 131535 its reverse (535131), we get a palindrome (666666).
It can be divided in two parts, 131 and 535, that added together give a palindrome (666).
The spelling of 131535 in words is "one hundred thirty-one thousand, five hundred thirty-five".
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