131691335 has 4 divisors (see below), whose sum is σ = 158029608. Its totient is φ = 105353064.

The previous prime is 131691331. The next prime is 131691359. The reversal of 131691335 is 533196131.

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

It is a cyclic number.

It is not a de Polignac number, because 131691335 - 2² = 131691331 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 (131691331) 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, 13169129 + ... + 13169138.

It is an arithmetic number, because the mean of its divisors is an integer number (39507402).

Almost surely, 2^131691335 is an apocalyptic number.

131691335 is a deficient number, since it is larger than the sum of its proper divisors (26338273).

131691335 is an equidigital number, since it uses as much as digits as its factorization.

131691335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26338272.

The product of its digits is 7290, while the sum is 32.

The square root of 131691335 is about 11475.6845111741. The cubic root of 131691335 is about 508.7671554764.

The spelling of 131691335 in words is "one hundred thirty-one million, six hundred ninety-one thousand, three hundred thirty-five".