420145541 has 2 divisors, whose sum is σ = 420145542. Its totient is φ = 420145540.

The previous prime is 420145519. The next prime is 420145547. The reversal of 420145541 is 145541024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 282576100 + 137569441 = 16810^2 + 11729^2 .

It is a cyclic number.

It is not a de Polignac number, because 420145541 - 2⁶ = 420145477 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 420145541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420145547) 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, 210072770 + 210072771.

It is an arithmetic number, because the mean of its divisors is an integer number (210072771).

Almost surely, 2^420145541 is an apocalyptic number.

It is an amenable number.

420145541 is a deficient number, since it is larger than the sum of its proper divisors (1).

420145541 is an equidigital number, since it uses as much as digits as its factorization.

420145541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 420145541 is about 20497.4520611709. The cubic root of 420145541 is about 748.9737317459.

Adding to 420145541 its reverse (145541024), we get a palindrome (565686565).

The spelling of 420145541 in words is "four hundred twenty million, one hundred forty-five thousand, five hundred forty-one".