131389493 has 2 divisors, whose sum is σ = 131389494. Its totient is φ = 131389492.

The previous prime is 131389483. The next prime is 131389499. The reversal of 131389493 is 394983131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100841764 + 30547729 = 10042^2 + 5527^2 .

It is a cyclic number.

It is not a de Polignac number, because 131389493 - 2⁶ = 131389429 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131389493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131389499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65694746 + 65694747.

It is an arithmetic number, because the mean of its divisors is an integer number (65694747).

Almost surely, 2^131389493 is an apocalyptic number.

It is an amenable number.

131389493 is a deficient number, since it is larger than the sum of its proper divisors (1).

131389493 is an equidigital number, since it uses as much as digits as its factorization.

131389493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 41.

The square root of 131389493 is about 11462.5255943008. The cubic root of 131389493 is about 508.3781529833.

The spelling of 131389493 in words is "one hundred thirty-one million, three hundred eighty-nine thousand, four hundred ninety-three".