538243501 has 4 divisors (see below), whose sum is σ = 541217404. Its totient is φ = 535269600.

The previous prime is 538243481. The next prime is 538243547. The reversal of 538243501 is 105342835.

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

It can be written as a sum of positive squares in 2 ways, for example, as 176863401 + 361380100 = 13299^2 + 19010^2 .

It is a cyclic number.

It is not a de Polignac number, because 538243501 - 2⁷ = 538243373 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 (538243801) 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 3 ways as a sum of consecutive naturals, for example, 1486680 + ... + 1487041.

It is an arithmetic number, because the mean of its divisors is an integer number (135304351).

Almost surely, 2^538243501 is an apocalyptic number.

It is an amenable number.

538243501 is a deficient number, since it is larger than the sum of its proper divisors (2973903).

538243501 is a wasteful number, since it uses less digits than its factorization.

538243501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2973902.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 538243501 is about 23200.0754524635. The cubic root of 538243501 is about 813.4413866826.

The spelling of 538243501 in words is "five hundred thirty-eight million, two hundred forty-three thousand, five hundred one".