33981977 has 2 divisors, whose sum is σ = 33981978. Its totient is φ = 33981976.

The previous prime is 33981973. The next prime is 33981979. The reversal of 33981977 is 77918933.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33918976 + 63001 = 5824^2 + 251^2 .

It is an emirp because it is prime and its reverse (77918933) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33981977 - 2² = 33981973 is a prime.

Together with 33981979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (33981973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16990988 + 16990989.

It is an arithmetic number, because the mean of its divisors is an integer number (16990989).

Almost surely, 2^33981977 is an apocalyptic number.

It is an amenable number.

33981977 is a deficient number, since it is larger than the sum of its proper divisors (1).

33981977 is an equidigital number, since it uses as much as digits as its factorization.

33981977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 47.

The square root of 33981977 is about 5829.4062304835. The cubic root of 33981977 is about 323.9039273401.

The spelling of 33981977 in words is "thirty-three million, nine hundred eighty-one thousand, nine hundred seventy-seven".