420531403 has 2 divisors, whose sum is σ = 420531404. Its totient is φ = 420531402.

The previous prime is 420531343. The next prime is 420531437. The reversal of 420531403 is 304135024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420531403 - 2²¹ = 418434251 is a prime.

It is equal to p_22371232 and since 420531403 and 22371232 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (420531493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210265701 + 210265702.

It is an arithmetic number, because the mean of its divisors is an integer number (210265702).

Almost surely, 2^420531403 is an apocalyptic number.

420531403 is a deficient number, since it is larger than the sum of its proper divisors (1).

420531403 is an equidigital number, since it uses as much as digits as its factorization.

420531403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 420531403 is about 20506.8623392268. The cubic root of 420531403 is about 749.2029476138.

Adding to 420531403 its reverse (304135024), we get a palindrome (724666427).

The spelling of 420531403 in words is "four hundred twenty million, five hundred thirty-one thousand, four hundred three".