33689861 has 2 divisors, whose sum is σ = 33689862. Its totient is φ = 33689860.

The previous prime is 33689857. The next prime is 33689879. The reversal of 33689861 is 16898633.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32273761 + 1416100 = 5681^2 + 1190^2 .

It is an emirp because it is prime and its reverse (16898633) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33689861 - 2² = 33689857 is a prime.

It is a super-2 number, since 2×33689861² = 2270013468398642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33689881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16844930 + 16844931.

It is an arithmetic number, because the mean of its divisors is an integer number (16844931).

Almost surely, 2^33689861 is an apocalyptic number.

It is an amenable number.

33689861 is a deficient number, since it is larger than the sum of its proper divisors (1).

33689861 is an equidigital number, since it uses as much as digits as its factorization.

33689861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 44.

The square root of 33689861 is about 5804.2967704968. The cubic root of 33689861 is about 322.9731404210.

The spelling of 33689861 in words is "thirty-three million, six hundred eighty-nine thousand, eight hundred sixty-one".