131343021 has 6 divisors (see below), whose sum is σ = 189717710. Its totient is φ = 87562008.

The previous prime is 131342993. The next prime is 131343031. The reversal of 131343021 is 120343131.

It can be written as a sum of positive squares in only one way, i.e., 107868996 + 23474025 = 10386^2 + 4845^2 .

It is not a de Polignac number, because 131343021 - 2¹³ = 131334829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 131342985 and 131343003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131343031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7296826 + ... + 7296843.

Almost surely, 2^131343021 is an apocalyptic number.

It is an amenable number.

131343021 is a deficient number, since it is larger than the sum of its proper divisors (58374689).

131343021 is a wasteful number, since it uses less digits than its factorization.

131343021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14593675 (or 14593672 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 131343021 is about 11460.4982875964. The cubic root of 131343021 is about 508.3182087291.

Adding to 131343021 its reverse (120343131), we get a palindrome (251686152).

The spelling of 131343021 in words is "one hundred thirty-one million, three hundred forty-three thousand, twenty-one".