131345381 has 2 divisors, whose sum is σ = 131345382. Its totient is φ = 131345380.

The previous prime is 131345377. The next prime is 131345407. The reversal of 131345381 is 183543131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130896481 + 448900 = 11441^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 131345381 - 2² = 131345377 is a prime.

It is a super-2 number, since 2×131345381² = 34503218220070322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131345351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65672690 + 65672691.

It is an arithmetic number, because the mean of its divisors is an integer number (65672691).

Almost surely, 2^131345381 is an apocalyptic number.

It is an amenable number.

131345381 is a deficient number, since it is larger than the sum of its proper divisors (1).

131345381 is an equidigital number, since it uses as much as digits as its factorization.

131345381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 131345381 is about 11460.6012494982. The cubic root of 131345381 is about 508.3212532350.

The spelling of 131345381 in words is "one hundred thirty-one million, three hundred forty-five thousand, three hundred eighty-one".