33979861 has 2 divisors, whose sum is σ = 33979862. Its totient is φ = 33979860.

The previous prime is 33979859. The next prime is 33979873. The reversal of 33979861 is 16897933.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31024900 + 2954961 = 5570^2 + 1719^2 .

It is a cyclic number.

It is not a de Polignac number, because 33979861 - 2¹ = 33979859 is a prime.

Together with 33979859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33979831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16989930 + 16989931.

It is an arithmetic number, because the mean of its divisors is an integer number (16989931).

Almost surely, 2^33979861 is an apocalyptic number.

It is an amenable number.

33979861 is a deficient number, since it is larger than the sum of its proper divisors (1).

33979861 is an equidigital number, since it uses as much as digits as its factorization.

33979861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 33979861 is about 5829.2247340448. The cubic root of 33979861 is about 323.8972042181.

It can be divided in two parts, 339 and 79861, that added together give a triangular number (80200 = T₄₀₀).

The spelling of 33979861 in words is "thirty-three million, nine hundred seventy-nine thousand, eight hundred sixty-one".