33420913 has 2 divisors, whose sum is σ = 33420914. Its totient is φ = 33420912.

The previous prime is 33420889. The next prime is 33420931. The reversal of 33420913 is 31902433.

It is a happy number.

Together with next prime (33420931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31438449 + 1982464 = 5607^2 + 1408^2 .

It is an emirp because it is prime and its reverse (31902433) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33420913 is a prime.

It is a super-2 number, since 2×33420913² = 2233914851507138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33420973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16710456 + 16710457.

It is an arithmetic number, because the mean of its divisors is an integer number (16710457).

Almost surely, 2^33420913 is an apocalyptic number.

It is an amenable number.

33420913 is a deficient number, since it is larger than the sum of its proper divisors (1).

33420913 is an equidigital number, since it uses as much as digits as its factorization.

33420913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 33420913 is about 5781.0823381094. The cubic root of 33420913 is about 322.1114058400. Note that the first 3 decimals are identical.

The spelling of 33420913 in words is "thirty-three million, four hundred twenty thousand, nine hundred thirteen".