132781991 has 4 divisors (see below), whose sum is σ = 132810984. Its totient is φ = 132753000.

The previous prime is 132781949. The next prime is 132782029. The reversal of 132781991 is 199187231.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-132781991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (132781931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5945 + ... + 17346.

It is an arithmetic number, because the mean of its divisors is an integer number (33202746).

Almost surely, 2^132781991 is an apocalyptic number.

132781991 is a deficient number, since it is larger than the sum of its proper divisors (28993).

132781991 is an equidigital number, since it uses as much as digits as its factorization.

132781991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28992.

The product of its digits is 27216, while the sum is 41.

The square root of 132781991 is about 11523.1068293234. The cubic root of 132781991 is about 510.1678173861.

The spelling of 132781991 in words is "one hundred thirty-two million, seven hundred eighty-one thousand, nine hundred ninety-one".