33780091 has 2 divisors, whose sum is σ = 33780092. Its totient is φ = 33780090.

The previous prime is 33780083. The next prime is 33780101. The reversal of 33780091 is 19008733.

33780091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (19008733) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33780091 - 2³ = 33780083 is a prime.

It is a super-2 number, since 2×33780091² = 2282189095936562, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 33780091 parts by 8219 straight cuts.

It is not a weakly prime, because it can be changed into another prime (33750091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16890045 + 16890046.

It is an arithmetic number, because the mean of its divisors is an integer number (16890046).

Almost surely, 2^33780091 is an apocalyptic number.

33780091 is a deficient number, since it is larger than the sum of its proper divisors (1).

33780091 is an equidigital number, since it uses as much as digits as its factorization.

33780091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 33780091 is about 5812.0642632373. The cubic root of 33780091 is about 323.2612180780.

The spelling of 33780091 in words is "thirty-three million, seven hundred eighty thousand, ninety-one".