133685777 has 2 divisors, whose sum is σ = 133685778. Its totient is φ = 133685776.

The previous prime is 133685771. The next prime is 133685779. The reversal of 133685777 is 777586331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74718736 + 58967041 = 8644^2 + 7679^2 .

It is a cyclic number.

It is not a de Polignac number, because 133685777 - 2²² = 129491473 is a prime.

Together with 133685779, it forms a pair of twin primes.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 133685777 parts by 16351 straight cuts.

It is not a weakly prime, because it can be changed into another prime (133685771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66842888 + 66842889.

It is an arithmetic number, because the mean of its divisors is an integer number (66842889).

Almost surely, 2^133685777 is an apocalyptic number.

It is an amenable number.

133685777 is a deficient number, since it is larger than the sum of its proper divisors (1).

133685777 is an equidigital number, since it uses as much as digits as its factorization.

133685777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 740880, while the sum is 47.

The square root of 133685777 is about 11562.2565704105. The cubic root of 133685777 is about 511.3226937361.

The spelling of 133685777 in words is "one hundred thirty-three million, six hundred eighty-five thousand, seven hundred seventy-seven".