405234331 has 2 divisors, whose sum is σ = 405234332. Its totient is φ = 405234330.

The previous prime is 405234293. The next prime is 405234353. The reversal of 405234331 is 133432504.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405234331 is a prime.

It is a super-2 number, since 2×405234331² = 328429726042035122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 405234296 and 405234305.

It is not a weakly prime, because it can be changed into another prime (405534331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202617165 + 202617166.

It is an arithmetic number, because the mean of its divisors is an integer number (202617166).

Almost surely, 2^405234331 is an apocalyptic number.

405234331 is a deficient number, since it is larger than the sum of its proper divisors (1).

405234331 is an equidigital number, since it uses as much as digits as its factorization.

405234331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 405234331 is about 20130.4329560991. The cubic root of 405234331 is about 740.0062886001.

Adding to 405234331 its reverse (133432504), we get a palindrome (538666835).

It can be divided in two parts, 4052 and 34331, that added together give a palindrome (38383).

The spelling of 405234331 in words is "four hundred five million, two hundred thirty-four thousand, three hundred thirty-one".