501001020 has 144 divisors (see below), whose sum is σ = 1645049952. Its totient is φ = 122688000.

The previous prime is 501001001. The next prime is 501001021. The reversal of 501001020 is 20100105.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 501000993 and 501001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501001021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 586914 + ... + 587766.

It is an arithmetic number, because the mean of its divisors is an integer number (11423958).

Almost surely, 2^501001020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 501001020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (822524976).

501001020 is an abundant number, since it is smaller than the sum of its proper divisors (1144048932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

501001020 is a wasteful number, since it uses less digits than its factorization.

501001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132 (or 1127 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 501001020 is about 22383.0520707074. The cubic root of 501001020 is about 794.2298463013.

Adding to 501001020 its reverse (20100105), we get a palindrome (521101125).

The spelling of 501001020 in words is "five hundred one million, one thousand, twenty".