131640085 has 4 divisors (see below), whose sum is σ = 157968108. Its totient is φ = 105312064.

The previous prime is 131640083. The next prime is 131640101. The reversal of 131640085 is 580046131.

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 92025649 + 39614436 = 9593^2 + 6294^2 .

It is a cyclic number.

It is not a de Polignac number, because 131640085 - 2¹ = 131640083 is a prime.

It is a super-2 number, since 2×131640085² = 34658223957614450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131640083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13164004 + ... + 13164013.

It is an arithmetic number, because the mean of its divisors is an integer number (39492027).

Almost surely, 2^131640085 is an apocalyptic number.

It is an amenable number.

131640085 is a deficient number, since it is larger than the sum of its proper divisors (26328023).

131640085 is an equidigital number, since it uses as much as digits as its factorization.

131640085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26328022.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 131640085 is about 11473.4513116150. The cubic root of 131640085 is about 508.7011483497.

The spelling of 131640085 in words is "one hundred thirty-one million, six hundred forty thousand, eighty-five".