406311331 has 2 divisors, whose sum is σ = 406311332. Its totient is φ = 406311330.

The previous prime is 406311293. The next prime is 406311337. The reversal of 406311331 is 133113604.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 406311331 - 2¹⁹ = 405787043 is a prime.

It is a super-2 number, since 2×406311331² = 330177795397983122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (406311337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203155665 + 203155666.

It is an arithmetic number, because the mean of its divisors is an integer number (203155666).

Almost surely, 2^406311331 is an apocalyptic number.

406311331 is a deficient number, since it is larger than the sum of its proper divisors (1).

406311331 is an equidigital number, since it uses as much as digits as its factorization.

406311331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 406311331 is about 20157.1657481899. The cubic root of 406311331 is about 740.6612855539.

Adding to 406311331 its reverse (133113604), we get a palindrome (539424935).

The spelling of 406311331 in words is "four hundred six million, three hundred eleven thousand, three hundred thirty-one".