139540501 has 4 divisors (see below), whose sum is σ = 140429452. Its totient is φ = 138651552.

The previous prime is 139540483. The next prime is 139540549. The reversal of 139540501 is 105045931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 105045931 = 199 ⋅527869.

It can be written as a sum of positive squares in 2 ways, for example, as 81018001 + 58522500 = 9001^2 + 7650^2 .

It is a cyclic number.

It is not a de Polignac number, because 139540501 - 2⁵ = 139540469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139540501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139540561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444240 + ... + 444553.

It is an arithmetic number, because the mean of its divisors is an integer number (35107363).

Almost surely, 2^139540501 is an apocalyptic number.

It is an amenable number.

139540501 is a deficient number, since it is larger than the sum of its proper divisors (888951).

139540501 is an equidigital number, since it uses as much as digits as its factorization.

139540501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888950.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 139540501 is about 11812.7262306379. The cubic root of 139540501 is about 518.6807051970.

It can be divided in two parts, 139540 and 501, that added together give a palindrome (140041).

The spelling of 139540501 in words is "one hundred thirty-nine million, five hundred forty thousand, five hundred one".