501010101 has 12 divisors (see below), whose sum is σ = 724664928. Its totient is φ = 333552744.

The previous prime is 501010099. The next prime is 501010117. The reversal of 501010101 is 101010105.

It is not a de Polignac number, because 501010101 - 2¹ = 501010099 is a prime.

It is a super-2 number, since 2×501010101² = 502022242608060402, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an alternating number because its digits alternate between odd and even.

501010101 is a modest number, since divided by 10101 gives 501 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501010171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30775 + ... + 44148.

It is an arithmetic number, because the mean of its divisors is an integer number (60388744).

Almost surely, 2^501010101 is an apocalyptic number.

It is an amenable number.

501010101 is a deficient number, since it is larger than the sum of its proper divisors (223654827).

501010101 is a wasteful number, since it uses less digits than its factorization.

501010101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75672 (or 75669 counting only the distinct ones).

The product of its (nonzero) digits is 5, while the sum is 9.

The square root of 501010101 is about 22383.2549241615. The cubic root of 501010101 is about 794.2346449327.

Adding to 501010101 its reverse (101010105), we get a palindrome (602020206).

The spelling of 501010101 in words is "five hundred one million, ten thousand, one hundred one".