501540501 has 32 divisors (see below), whose sum is σ = 841420800. Its totient is φ = 258137280.

The previous prime is 501540499. The next prime is 501540503. The reversal of 501540501 is 105045105.

It is an interprime number because it is at equal distance from previous prime (501540499) and next prime (501540503).

It is not a de Polignac number, because 501540501 - 2¹ = 501540499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501540503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15220 + ... + 35138.

It is an arithmetic number, because the mean of its divisors is an integer number (26294400).

Almost surely, 2^501540501 is an apocalyptic number.

It is an amenable number.

501540501 is a deficient number, since it is larger than the sum of its proper divisors (339880299).

501540501 is a wasteful number, since it uses less digits than its factorization.

501540501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20049.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 501540501 is about 22395.0999327978. The cubic root of 501540501 is about 794.5148212433.

Adding to 501540501 its reverse (105045105), we get a palindrome (606585606).

The spelling of 501540501 in words is "five hundred one million, five hundred forty thousand, five hundred one".