132991 has 4 divisors (see below), whose sum is σ = 140832. Its totient is φ = 125152.

The previous prime is 132989. The next prime is 133013. The reversal of 132991 is 199231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199231 = 167 ⋅1193.

It is a cyclic number.

It is not a de Polignac number, because 132991 - 2¹ = 132989 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (132911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3895 + ... + 3928.

It is an arithmetic number, because the mean of its divisors is an integer number (35208).

2¹³²⁹⁹¹ is an apocalyptic number.

132991 is a deficient number, since it is larger than the sum of its proper divisors (7841).

132991 is an equidigital number, since it uses as much as digits as its factorization.

132991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7840.

The product of its digits is 486, while the sum is 25.

The square root of 132991 is about 364.6793111763. The cubic root of 132991 is about 51.0435358101.

It can be divided in two parts, 13 and 2991, that multiplied together give a palindrome (38883).

The spelling of 132991 in words is "one hundred thirty-two thousand, nine hundred ninety-one".