406543121 has 2 divisors, whose sum is σ = 406543122. Its totient is φ = 406543120.

The previous prime is 406543061. The next prime is 406543127. The reversal of 406543121 is 121345604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 405619600 + 923521 = 20140^2 + 961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406543121 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (406543127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203271560 + 203271561.

It is an arithmetic number, because the mean of its divisors is an integer number (203271561).

Almost surely, 2^406543121 is an apocalyptic number.

It is an amenable number.

406543121 is a deficient number, since it is larger than the sum of its proper divisors (1).

406543121 is an equidigital number, since it uses as much as digits as its factorization.

406543121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 406543121 is about 20162.9144966694. The cubic root of 406543121 is about 740.8021014183.

Adding to 406543121 its reverse (121345604), we get a palindrome (527888725).

The spelling of 406543121 in words is "four hundred six million, five hundred forty-three thousand, one hundred twenty-one".