131771381 has 16 divisors (see below), whose sum is σ = 153089664. Its totient is φ = 111089664.

The previous prime is 131771377. The next prime is 131771401. The reversal of 131771381 is 183177131.

It is not a de Polignac number, because 131771381 - 2² = 131771377 is a prime.

It is a super-2 number, since 2×131771381² = 34727393701294322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131771371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195461 + ... + 196133.

It is an arithmetic number, because the mean of its divisors is an integer number (9568104).

Almost surely, 2^131771381 is an apocalyptic number.

It is an amenable number.

131771381 is a deficient number, since it is larger than the sum of its proper divisors (21318283).

131771381 is an equidigital number, since it uses as much as digits as its factorization.

131771381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100.

The product of its digits is 3528, while the sum is 32.

The square root of 131771381 is about 11479.1716164539. The cubic root of 131771381 is about 508.8702159834.

The spelling of 131771381 in words is "one hundred thirty-one million, seven hundred seventy-one thousand, three hundred eighty-one".