33391997 has 2 divisors, whose sum is σ = 33391998. Its totient is φ = 33391996.

The previous prime is 33391993. The next prime is 33392003. The reversal of 33391997 is 79919333.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26894596 + 6497401 = 5186^2 + 2549^2 .

It is a cyclic number.

It is not a de Polignac number, because 33391997 - 2² = 33391993 is a prime.

It is a super-2 number, since 2×33391997² = 2230050927296018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33391993) 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, 16695998 + 16695999.

It is an arithmetic number, because the mean of its divisors is an integer number (16695999).

Almost surely, 2^33391997 is an apocalyptic number.

It is an amenable number.

33391997 is a deficient number, since it is larger than the sum of its proper divisors (1).

33391997 is an equidigital number, since it uses as much as digits as its factorization.

33391997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 137781, while the sum is 44.

The square root of 33391997 is about 5778.5808811507. The cubic root of 33391997 is about 322.0184813795.

The spelling of 33391997 in words is "thirty-three million, three hundred ninety-one thousand, nine hundred ninety-seven".