131087893 has 4 divisors (see below), whose sum is σ = 131133420. Its totient is φ = 131042368.

The previous prime is 131087863. The next prime is 131087903. The reversal of 131087893 is 398780131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 398780131 = 29 ⋅13751039.

It can be written as a sum of positive squares in 2 ways, for example, as 128187684 + 2900209 = 11322^2 + 1703^2 .

It is a cyclic number.

It is not a de Polignac number, because 131087893 - 2⁵ = 131087861 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131087813) 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, 18130 + ... + 24307.

It is an arithmetic number, because the mean of its divisors is an integer number (32783355).

Almost surely, 2^131087893 is an apocalyptic number.

It is an amenable number.

131087893 is a deficient number, since it is larger than the sum of its proper divisors (45527).

131087893 is an equidigital number, since it uses as much as digits as its factorization.

131087893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45526.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 131087893 is about 11449.3621219699. The cubic root of 131087893 is about 507.9888668587.

The spelling of 131087893 in words is "one hundred thirty-one million, eighty-seven thousand, eight hundred ninety-three".