139513525 has 6 divisors (see below), whose sum is σ = 172996802. Its totient is φ = 111610800.

The previous prime is 139513511. The next prime is 139513537. The reversal of 139513525 is 525315931.

It can be written as a sum of positive squares in 3 ways, for example, as 603729 + 138909796 = 777^2 + 11786^2 .

It is a de Polignac number, because none of the positive numbers 2^k-139513525 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2790246 + ... + 2790295.

Almost surely, 2^139513525 is an apocalyptic number.

It is an amenable number.

139513525 is a deficient number, since it is larger than the sum of its proper divisors (33483277).

139513525 is an equidigital number, since it uses as much as digits as its factorization.

139513525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5580551 (or 5580546 counting only the distinct ones).

The product of its digits is 20250, while the sum is 34.

The square root of 139513525 is about 11811.5843560464. The cubic root of 139513525 is about 518.6472792207.

The spelling of 139513525 in words is "one hundred thirty-nine million, five hundred thirteen thousand, five hundred twenty-five".