139140521 has 16 divisors (see below), whose sum is σ = 156114000. Its totient is φ = 123126528.

The previous prime is 139140503. The next prime is 139140523. The reversal of 139140521 is 125041931.

It can be written as a sum of positive squares in 8 ways, for example, as 21114025 + 118026496 = 4595^2 + 10864^2 .

It is a cyclic number.

It is not a de Polignac number, because 139140521 - 2⁶ = 139140457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139140523) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 54935 + ... + 57411.

It is an arithmetic number, because the mean of its divisors is an integer number (9757125).

Almost surely, 2^139140521 is an apocalyptic number.

It is an amenable number.

139140521 is a deficient number, since it is larger than the sum of its proper divisors (16973479).

139140521 is a wasteful number, since it uses less digits than its factorization.

139140521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2668.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 139140521 is about 11795.7840349847. The cubic root of 139140521 is about 518.1846474295.

The spelling of 139140521 in words is "one hundred thirty-nine million, one hundred forty thousand, five hundred twenty-one".