133811361 has 6 divisors (see below), whose sum is σ = 193283090. Its totient is φ = 89207568.

The previous prime is 133811333. The next prime is 133811371. The reversal of 133811361 is 163118331.

It can be written as a sum of positive squares in only one way, i.e., 73205136 + 60606225 = 8556^2 + 7785^2 .

It is not a de Polignac number, because 133811361 - 2⁶ = 133811297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133811371) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7433956 + ... + 7433973.

Almost surely, 2^133811361 is an apocalyptic number.

It is an amenable number.

133811361 is a deficient number, since it is larger than the sum of its proper divisors (59471729).

133811361 is a wasteful number, since it uses less digits than its factorization.

133811361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14867935 (or 14867932 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 133811361 is about 11567.6860693918. The cubic root of 133811361 is about 511.4827552715.

Adding to 133811361 its reverse (163118331), we get a palindrome (296929692).

The spelling of 133811361 in words is "one hundred thirty-three million, eight hundred eleven thousand, three hundred sixty-one".