131155441 has 2 divisors, whose sum is σ = 131155442. Its totient is φ = 131155440.

The previous prime is 131155439. The next prime is 131155447. The reversal of 131155441 is 144551131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111830625 + 19324816 = 10575^2 + 4396^2 .

It is a cyclic number.

It is not a de Polignac number, because 131155441 - 2¹ = 131155439 is a prime.

Together with 131155439, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (131155447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65577720 + 65577721.

It is an arithmetic number, because the mean of its divisors is an integer number (65577721).

Almost surely, 2^131155441 is an apocalyptic number.

It is an amenable number.

131155441 is a deficient number, since it is larger than the sum of its proper divisors (1).

131155441 is an equidigital number, since it uses as much as digits as its factorization.

131155441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1200, while the sum is 25.

The square root of 131155441 is about 11452.3116007206. The cubic root of 131155441 is about 508.0761053750.

The spelling of 131155441 in words is "one hundred thirty-one million, one hundred fifty-five thousand, four hundred forty-one".