131181589381 has 2 divisors, whose sum is σ = 131181589382. Its totient is φ = 131181589380.

The previous prime is 131181589367. The next prime is 131181589403. The reversal of 131181589381 is 183985181131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126860630625 + 4320958756 = 356175^2 + 65734^2 .

It is a cyclic number.

It is not a de Polignac number, because 131181589381 - 2²¹ = 131179492229 is a prime.

It is a super-2 number, since 2×131181589381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131181589321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65590794690 + 65590794691.

It is an arithmetic number, because the mean of its divisors is an integer number (65590794691).

Almost surely, 2^131181589381 is an apocalyptic number.

It is an amenable number.

131181589381 is a deficient number, since it is larger than the sum of its proper divisors (1).

131181589381 is an equidigital number, since it uses as much as digits as its factorization.

131181589381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 49.

The spelling of 131181589381 in words is "one hundred thirty-one billion, one hundred eighty-one million, five hundred eighty-nine thousand, three hundred eighty-one".