133776161 has 2 divisors, whose sum is σ = 133776162. Its totient is φ = 133776160.

The previous prime is 133776157. The next prime is 133776221. The reversal of 133776161 is 161677331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127803025 + 5973136 = 11305^2 + 2444^2 .

It is an emirp because it is prime and its reverse (161677331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133776161 - 2² = 133776157 is a prime.

It is a super-2 number, since 2×133776161² = 35792122503795842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133776761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66888080 + 66888081.

It is an arithmetic number, because the mean of its divisors is an integer number (66888081).

Almost surely, 2^133776161 is an apocalyptic number.

It is an amenable number.

133776161 is a deficient number, since it is larger than the sum of its proper divisors (1).

133776161 is an equidigital number, since it uses as much as digits as its factorization.

133776161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 35.

The square root of 133776161 is about 11566.1644895791. The cubic root of 133776161 is about 511.4379016513.

The spelling of 133776161 in words is "one hundred thirty-three million, seven hundred seventy-six thousand, one hundred sixty-one".