420502501 has 4 divisors (see below), whose sum is σ = 420581772. Its totient is φ = 420423232.

The previous prime is 420502451. The next prime is 420502513. The reversal of 420502501 is 105205024.

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 213890625 + 206611876 = 14625^2 + 14374^2 .

It is a cyclic number.

It is not a de Polignac number, because 420502501 - 2¹³ = 420494309 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 (420502571) 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, 31060 + ... + 42493.

It is an arithmetic number, because the mean of its divisors is an integer number (105145443).

Almost surely, 2^420502501 is an apocalyptic number.

It is an amenable number.

420502501 is a deficient number, since it is larger than the sum of its proper divisors (79271).

420502501 is an equidigital number, since it uses as much as digits as its factorization.

420502501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79270.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 420502501 is about 20506.1576361833. The cubic root of 420502501 is about 749.1857836481.

Adding to 420502501 its reverse (105205024), we get a palindrome (525707525).

It can be divided in two parts, 42050 and 2501, that added together give a triangular number (44551 = T₂₉₈).

The spelling of 420502501 in words is "four hundred twenty million, five hundred two thousand, five hundred one".