33228731 has 2 divisors, whose sum is σ = 33228732. Its totient is φ = 33228730.

The previous prime is 33228719. The next prime is 33228733. The reversal of 33228731 is 13782233.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 33228731 - 2²² = 29034427 is a prime.

It is a super-2 number, since 2×33228731² = 2208297127740722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 33228733, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 33228694 and 33228703.

It is not a weakly prime, because it can be changed into another prime (33228733) 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 as a sum of consecutive naturals, namely, 16614365 + 16614366.

It is an arithmetic number, because the mean of its divisors is an integer number (16614366).

Almost surely, 2^33228731 is an apocalyptic number.

33228731 is a deficient number, since it is larger than the sum of its proper divisors (1).

33228731 is an equidigital number, since it uses as much as digits as its factorization.

33228731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 29.

The square root of 33228731 is about 5764.4367461184. The cubic root of 33228731 is about 321.4928006437.

The spelling of 33228731 in words is "thirty-three million, two hundred twenty-eight thousand, seven hundred thirty-one".