405241 has 2 divisors, whose sum is σ = 405242. Its totient is φ = 405240.

The previous prime is 405239. The next prime is 405247. The reversal of 405241 is 142504.

405241 is an esthetic number in base 9, because in such base its adjacent digits differ by 1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 385641 + 19600 = 621^2 + 140^2 .

It is a cyclic number.

It is not a de Polignac number, because 405241 - 2¹ = 405239 is a prime.

Together with 405239, it forms a pair of twin primes.

It is an Ulam number.

405241 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202620 + 202621.

It is an arithmetic number, because the mean of its divisors is an integer number (202621).

2⁴⁰⁵²⁴¹ is an apocalyptic number.

It is an amenable number.

405241 is a deficient number, since it is larger than the sum of its proper divisors (1).

405241 is an equidigital number, since it uses as much as digits as its factorization.

405241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 405241 is about 636.5854223904. The cubic root of 405241 is about 74.0010348041.

Adding to 405241 its reverse (142504), we get a palindrome (547745).

It can be divided in two parts, 405 and 241, that added together give a palindrome (646).

The spelling of 405241 in words is "four hundred five thousand, two hundred forty-one".