139311487 has 4 divisors (see below), whose sum is σ = 159213136. Its totient is φ = 119409840.

The previous prime is 139311451. The next prime is 139311511. The reversal of 139311487 is 784113931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139311487 - 2¹¹ = 139309439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139311187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9950814 + ... + 9950827.

It is an arithmetic number, because the mean of its divisors is an integer number (39803284).

Almost surely, 2^139311487 is an apocalyptic number.

139311487 is a deficient number, since it is larger than the sum of its proper divisors (19901649).

139311487 is an equidigital number, since it uses as much as digits as its factorization.

139311487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19901648.

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

The square root of 139311487 is about 11803.0287214765. The cubic root of 139311487 is about 518.3967967381.

It can be divided in two parts, 1393 and 11487, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 139311487 in words is "one hundred thirty-nine million, three hundred eleven thousand, four hundred eighty-seven".