420403541 has 2 divisors, whose sum is σ = 420403542. Its totient is φ = 420403540.

The previous prime is 420403507. The next prime is 420403553. The reversal of 420403541 is 145304024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397803025 + 22600516 = 19945^2 + 4754^2 .

It is a cyclic number.

It is not a de Polignac number, because 420403541 - 2¹⁰ = 420402517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420403241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210201770 + 210201771.

It is an arithmetic number, because the mean of its divisors is an integer number (210201771).

Almost surely, 2^420403541 is an apocalyptic number.

It is an amenable number.

420403541 is a deficient number, since it is larger than the sum of its proper divisors (1).

420403541 is an equidigital number, since it uses as much as digits as its factorization.

420403541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 420403541 is about 20503.7445604455. The cubic root of 420403541 is about 749.1270085384.

Adding to 420403541 its reverse (145304024), we get a palindrome (565707565).

The spelling of 420403541 in words is "four hundred twenty million, four hundred three thousand, five hundred forty-one".