131023381 has 2 divisors, whose sum is σ = 131023382. Its totient is φ = 131023380.

The previous prime is 131023379. The next prime is 131023423. The reversal of 131023381 is 183320131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126922756 + 4100625 = 11266^2 + 2025^2 .

It is an emirp because it is prime and its reverse (183320131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131023381 - 2¹ = 131023379 is a prime.

It is a super-2 number, since 2×131023381² = 34334252737342322, which contains 22 as substring.

Together with 131023379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131023481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65511690 + 65511691.

It is an arithmetic number, because the mean of its divisors is an integer number (65511691).

Almost surely, 2^131023381 is an apocalyptic number.

It is an amenable number.

131023381 is a deficient number, since it is larger than the sum of its proper divisors (1).

131023381 is an equidigital number, since it uses as much as digits as its factorization.

131023381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 131023381 is about 11446.5445004158. The cubic root of 131023381 is about 507.9055213659.

The spelling of 131023381 in words is "one hundred thirty-one million, twenty-three thousand, three hundred eighty-one".