139663523 has 4 divisors (see below), whose sum is σ = 139687200. Its totient is φ = 139639848.

The previous prime is 139663499. The next prime is 139663541. The reversal of 139663523 is 325366931.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 139663523 - 2⁸ = 139663267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139663583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4886 + ... + 17412.

It is an arithmetic number, because the mean of its divisors is an integer number (34921800).

Almost surely, 2^139663523 is an apocalyptic number.

139663523 is a deficient number, since it is larger than the sum of its proper divisors (23677).

139663523 is a wasteful number, since it uses less digits than its factorization.

139663523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23676.

The product of its digits is 87480, while the sum is 38.

The square root of 139663523 is about 11817.9322641484. The cubic root of 139663523 is about 518.8330872284.

The spelling of 139663523 in words is "one hundred thirty-nine million, six hundred sixty-three thousand, five hundred twenty-three".