131858 has 4 divisors (see below), whose sum is σ = 197790. Its totient is φ = 65928.

The previous prime is 131849. The next prime is 131861. The reversal of 131858 is 858131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 858131 = 347 ⋅2473.

It can be written as a sum of positive squares in only one way, i.e., 120409 + 11449 = 347^2 + 107^2 .

It is an unprimeable number.

131858 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32963 + ... + 32966.

2¹³¹⁸⁵⁸ is an apocalyptic number.

131858 is a deficient number, since it is larger than the sum of its proper divisors (65932).

131858 is an equidigital number, since it uses as much as digits as its factorization.

131858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65931.

The product of its digits is 960, while the sum is 26.

The square root of 131858 is about 363.1225688387. The cubic root of 131858 is about 50.8981692326.

Adding to 131858 its reverse (858131), we get a palindrome (989989).

It can be divided in two parts, 131 and 858, that added together give a palindrome (989).

The spelling of 131858 in words is "one hundred thirty-one thousand, eight hundred fifty-eight".