133423541 has 2 divisors, whose sum is σ = 133423542. Its totient is φ = 133423540.

The previous prime is 133423513. The next prime is 133423561. The reversal of 133423541 is 145324331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85951441 + 47472100 = 9271^2 + 6890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133423541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133423541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133423501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66711770 + 66711771.

It is an arithmetic number, because the mean of its divisors is an integer number (66711771).

Almost surely, 2^133423541 is an apocalyptic number.

It is an amenable number.

133423541 is a deficient number, since it is larger than the sum of its proper divisors (1).

133423541 is an equidigital number, since it uses as much as digits as its factorization.

133423541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 26.

The square root of 133423541 is about 11550.9108298870. The cubic root of 133423541 is about 510.9881405994.

Adding to 133423541 its reverse (145324331), we get a palindrome (278747872).

The spelling of 133423541 in words is "one hundred thirty-three million, four hundred twenty-three thousand, five hundred forty-one".