131711845 has 4 divisors (see below), whose sum is σ = 158054220. Its totient is φ = 105369472.

The previous prime is 131711843. The next prime is 131711863. The reversal of 131711845 is 548117131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 548117131 = 569 ⋅963299.

It can be written as a sum of positive squares in 2 ways, for example, as 20493729 + 111218116 = 4527^2 + 10546^2 .

It is a cyclic number.

It is not a de Polignac number, because 131711845 - 2¹ = 131711843 is a prime.

It is a super-2 number, since 2×131711845² = 34696020226608050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131711843) 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, 13171180 + ... + 13171189.

It is an arithmetic number, because the mean of its divisors is an integer number (39513555).

Almost surely, 2^131711845 is an apocalyptic number.

It is an amenable number.

131711845 is a deficient number, since it is larger than the sum of its proper divisors (26342375).

131711845 is an equidigital number, since it uses as much as digits as its factorization.

131711845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26342374.

The product of its digits is 3360, while the sum is 31.

The square root of 131711845 is about 11476.5781049928. The cubic root of 131711845 is about 508.7935664084.

Adding to 131711845 its reverse (548117131), we get a palindrome (679828976).

The spelling of 131711845 in words is "one hundred thirty-one million, seven hundred eleven thousand, eight hundred forty-five".