131431789 has 2 divisors, whose sum is σ = 131431790. Its totient is φ = 131431788.

The previous prime is 131431753. The next prime is 131431801. The reversal of 131431789 is 987134131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66096900 + 65334889 = 8130^2 + 8083^2 .

It is an emirp because it is prime and its reverse (987134131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131431789 - 2¹⁹ = 130907501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131432789) 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 as a sum of consecutive naturals, namely, 65715894 + 65715895.

It is an arithmetic number, because the mean of its divisors is an integer number (65715895).

Almost surely, 2^131431789 is an apocalyptic number.

It is an amenable number.

131431789 is a deficient number, since it is larger than the sum of its proper divisors (1).

131431789 is an equidigital number, since it uses as much as digits as its factorization.

131431789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 131431789 is about 11464.3704144624. The cubic root of 131431789 is about 508.4326983277.

The spelling of 131431789 in words is "one hundred thirty-one million, four hundred thirty-one thousand, seven hundred eighty-nine".