131667845 has 4 divisors (see below), whose sum is σ = 158001420. Its totient is φ = 105334272.

The previous prime is 131667827. The next prime is 131667857. The reversal of 131667845 is 548766131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 548766131 = 23 ⋅23859397.

It can be written as a sum of positive squares in 2 ways, for example, as 91738084 + 39929761 = 9578^2 + 6319^2 .

It is a cyclic number.

It is not a de Polignac number, because 131667845 - 2⁸ = 131667589 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13166780 + ... + 13166789.

It is an arithmetic number, because the mean of its divisors is an integer number (39500355).

Almost surely, 2^131667845 is an apocalyptic number.

It is an amenable number.

131667845 is a deficient number, since it is larger than the sum of its proper divisors (26333575).

131667845 is an equidigital number, since it uses as much as digits as its factorization.

131667845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26333574.

The product of its digits is 120960, while the sum is 41.

The square root of 131667845 is about 11474.6609971711. The cubic root of 131667845 is about 508.7369037995.

The spelling of 131667845 in words is "one hundred thirty-one million, six hundred sixty-seven thousand, eight hundred forty-five".