421504541 has 2 divisors, whose sum is σ = 421504542. Its totient is φ = 421504540.

The previous prime is 421504519. The next prime is 421504561. The reversal of 421504541 is 145405124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238578916 + 182925625 = 15446^2 + 13525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421504541 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421504541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421504561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210752270 + 210752271.

It is an arithmetic number, because the mean of its divisors is an integer number (210752271).

Almost surely, 2^421504541 is an apocalyptic number.

It is an amenable number.

421504541 is a deficient number, since it is larger than the sum of its proper divisors (1).

421504541 is an equidigital number, since it uses as much as digits as its factorization.

421504541 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 26.

The square root of 421504541 is about 20530.5757590965. The cubic root of 421504541 is about 749.7804044507.

Adding to 421504541 its reverse (145405124), we get a palindrome (566909665).

The spelling of 421504541 in words is "four hundred twenty-one million, five hundred four thousand, five hundred forty-one".