420631501 has 4 divisors (see below), whose sum is σ = 421011900. Its totient is φ = 420251104.

The previous prime is 420631487. The next prime is 420631531. The reversal of 420631501 is 105136024.

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 10569001 + 410062500 = 3251^2 + 20250^2 .

It is a cyclic number.

It is not a de Polignac number, because 420631501 - 2¹³ = 420623309 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 (420631531) 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, 188536 + ... + 190753.

It is an arithmetic number, because the mean of its divisors is an integer number (105252975).

Almost surely, 2^420631501 is an apocalyptic number.

It is an amenable number.

420631501 is a deficient number, since it is larger than the sum of its proper divisors (380399).

420631501 is a wasteful number, since it uses less digits than its factorization.

420631501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380398.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 420631501 is about 20509.3027916602. The cubic root of 420631501 is about 749.2623865100.

Adding to 420631501 its reverse (105136024), we get a palindrome (525767525).

The spelling of 420631501 in words is "four hundred twenty million, six hundred thirty-one thousand, five hundred one".