406543261 has 4 divisors (see below), whose sum is σ = 406622592. Its totient is φ = 406463932.

The previous prime is 406543259. The next prime is 406543273. The reversal of 406543261 is 162345604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 406543261 - 2¹ = 406543259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406543201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31405 + ... + 42418.

It is an arithmetic number, because the mean of its divisors is an integer number (101655648).

Almost surely, 2^406543261 is an apocalyptic number.

It is an amenable number.

406543261 is a deficient number, since it is larger than the sum of its proper divisors (79331).

406543261 is an equidigital number, since it uses as much as digits as its factorization.

406543261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79330.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 406543261 is about 20162.9179683894. The cubic root of 406543261 is about 740.8021864542.

Adding to 406543261 its reverse (162345604), we get a palindrome (568888865).

The spelling of 406543261 in words is "four hundred six million, five hundred forty-three thousand, two hundred sixty-one".