31226805 has 24 divisors (see below), whose sum is σ = 55151928. Its totient is φ = 16338816.

The previous prime is 31226803. The next prime is 31226809. The reversal of 31226805 is 50862213.

It can be written as a sum of positive squares in 4 ways, for example, as 12068676 + 19158129 = 3474^2 + 4377^2 .

It is not a de Polignac number, because 31226805 - 2¹ = 31226803 is a prime.

It is a super-2 number, since 2×31226805² = 1950226701016050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31226803) 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 23 ways as a sum of consecutive naturals, for example, 4162 + ... + 8931.

It is an arithmetic number, because the mean of its divisors is an integer number (2297997).

Almost surely, 2^31226805 is an apocalyptic number.

It is an amenable number.

31226805 is a deficient number, since it is larger than the sum of its proper divisors (23925123).

31226805 is a wasteful number, since it uses less digits than its factorization.

31226805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13157 (or 13154 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 31226805 is about 5588.0949347698. The cubic root of 31226805 is about 314.9023128681.

The spelling of 31226805 in words is "thirty-one million, two hundred twenty-six thousand, eight hundred five".