421387541 has 2 divisors, whose sum is σ = 421387542. Its totient is φ = 421387540.

The previous prime is 421387513. The next prime is 421387543. The reversal of 421387541 is 145783124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 414285316 + 7102225 = 20354^2 + 2665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421387541 is a prime.

Together with 421387543, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421387543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210693770 + 210693771.

It is an arithmetic number, because the mean of its divisors is an integer number (210693771).

Almost surely, 2^421387541 is an apocalyptic number.

It is an amenable number.

421387541 is a deficient number, since it is larger than the sum of its proper divisors (1).

421387541 is an equidigital number, since it uses as much as digits as its factorization.

421387541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 35.

The square root of 421387541 is about 20527.7261526941. The cubic root of 421387541 is about 749.7110240789.

The spelling of 421387541 in words is "four hundred twenty-one million, three hundred eighty-seven thousand, five hundred forty-one".