420531401 has 4 divisors (see below), whose sum is σ = 421883904. Its totient is φ = 419178900.

The previous prime is 420531343. The next prime is 420531403. The reversal of 420531401 is 104135024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420531401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420531403) 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, 675785 + ... + 676406.

It is an arithmetic number, because the mean of its divisors is an integer number (105470976).

Almost surely, 2^420531401 is an apocalyptic number.

It is an amenable number.

420531401 is a deficient number, since it is larger than the sum of its proper divisors (1352503).

420531401 is a wasteful number, since it uses less digits than its factorization.

420531401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352502.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 420531401 is about 20506.8622904627. The cubic root of 420531401 is about 749.2029464261.

Adding to 420531401 its reverse (104135024), we get a palindrome (524666425).

The spelling of 420531401 in words is "four hundred twenty million, five hundred thirty-one thousand, four hundred one".