131167661 has 4 divisors (see below), whose sum is σ = 131341692. Its totient is φ = 130993632.

The previous prime is 131167613. The next prime is 131167669. The reversal of 131167661 is 166761131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 105472900 + 25694761 = 10270^2 + 5069^2 .

It is a cyclic number.

It is not a de Polignac number, because 131167661 - 2¹⁸ = 130905517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131167669) 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, 85880 + ... + 87393.

It is an arithmetic number, because the mean of its divisors is an integer number (32835423).

Almost surely, 2^131167661 is an apocalyptic number.

It is an amenable number.

131167661 is a deficient number, since it is larger than the sum of its proper divisors (174031).

131167661 is an equidigital number, since it uses as much as digits as its factorization.

131167661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174030.

The product of its digits is 4536, while the sum is 32.

The square root of 131167661 is about 11452.8451050383. The cubic root of 131167661 is about 508.0918843549.

The spelling of 131167661 in words is "one hundred thirty-one million, one hundred sixty-seven thousand, six hundred sixty-one".