420504541 has 2 divisors, whose sum is σ = 420504542. Its totient is φ = 420504540.

The previous prime is 420504521. The next prime is 420504547. The reversal of 420504541 is 145405024.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214007641 + 206496900 = 14629^2 + 14370^2 .

It is a cyclic number.

It is not a de Polignac number, because 420504541 - 2¹⁷ = 420373469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420504547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210252270 + 210252271.

It is an arithmetic number, because the mean of its divisors is an integer number (210252271).

Almost surely, 2^420504541 is an apocalyptic number.

It is an amenable number.

420504541 is a deficient number, since it is larger than the sum of its proper divisors (1).

420504541 is an equidigital number, since it uses as much as digits as its factorization.

420504541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 420504541 is about 20506.2073772797. The cubic root of 420504541 is about 749.1869951641.

Adding to 420504541 its reverse (145405024), we get a palindrome (565909565).

The spelling of 420504541 in words is "four hundred twenty million, five hundred four thousand, five hundred forty-one".