405211231 has 4 divisors (see below), whose sum is σ = 414634792. Its totient is φ = 395787672.

The previous prime is 405211223. The next prime is 405211253. The reversal of 405211231 is 132112504.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 405211231 - 2³ = 405211223 is a prime.

It is a super-2 number, since 2×405211231² = 328392283457070722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 405211199 and 405211208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405211211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4711716 + ... + 4711801.

It is an arithmetic number, because the mean of its divisors is an integer number (103658698).

Almost surely, 2^405211231 is an apocalyptic number.

405211231 is a deficient number, since it is larger than the sum of its proper divisors (9423561).

405211231 is an equidigital number, since it uses as much as digits as its factorization.

405211231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9423560.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 405211231 is about 20129.8591897708. The cubic root of 405211231 is about 739.9922272132.

Adding to 405211231 its reverse (132112504), we get a palindrome (537323735).

The spelling of 405211231 in words is "four hundred five million, two hundred eleven thousand, two hundred thirty-one".