131531143 has 2 divisors, whose sum is σ = 131531144. Its totient is φ = 131531142.

The previous prime is 131531093. The next prime is 131531149. The reversal of 131531143 is 341135131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131531143 - 2²¹ = 129433991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131531149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65765571 + 65765572.

It is an arithmetic number, because the mean of its divisors is an integer number (65765572).

Almost surely, 2^131531143 is an apocalyptic number.

131531143 is a deficient number, since it is larger than the sum of its proper divisors (1).

131531143 is an equidigital number, since it uses as much as digits as its factorization.

131531143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 22.

The square root of 131531143 is about 11468.7027601207. The cubic root of 131531143 is about 508.5607802258.

Adding to 131531143 its reverse (341135131), we get a palindrome (472666274).

The spelling of 131531143 in words is "one hundred thirty-one million, five hundred thirty-one thousand, one hundred forty-three".