131485639 has 2 divisors, whose sum is σ = 131485640. Its totient is φ = 131485638.

The previous prime is 131485631. The next prime is 131485661. The reversal of 131485639 is 936584131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131485639 - 2³ = 131485631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131485631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65742819 + 65742820.

It is an arithmetic number, because the mean of its divisors is an integer number (65742820).

Almost surely, 2^131485639 is an apocalyptic number.

131485639 is a deficient number, since it is larger than the sum of its proper divisors (1).

131485639 is an equidigital number, since it uses as much as digits as its factorization.

131485639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 40.

The square root of 131485639 is about 11466.7187547267. The cubic root of 131485639 is about 508.5021268950.

The spelling of 131485639 in words is "one hundred thirty-one million, four hundred eighty-five thousand, six hundred thirty-nine".