133105541 has 4 divisors (see below), whose sum is σ = 133211052. Its totient is φ = 133000032.

The previous prime is 133105493. The next prime is 133105543. The reversal of 133105541 is 145501331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 93993025 + 39112516 = 9695^2 + 6254^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133105541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133105543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50840 + ... + 53393.

It is an arithmetic number, because the mean of its divisors is an integer number (33302763).

Almost surely, 2^133105541 is an apocalyptic number.

It is an amenable number.

133105541 is a deficient number, since it is larger than the sum of its proper divisors (105511).

133105541 is a wasteful number, since it uses less digits than its factorization.

133105541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105510.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 133105541 is about 11537.1374699273. The cubic root of 133105541 is about 510.5818567351.

Adding to 133105541 its reverse (145501331), we get a palindrome (278606872).

The spelling of 133105541 in words is "one hundred thirty-three million, one hundred five thousand, five hundred forty-one".