133405541 has 2 divisors, whose sum is σ = 133405542. Its totient is φ = 133405540.

The previous prime is 133405501. The next prime is 133405603. The reversal of 133405541 is 145504331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82283041 + 51122500 = 9071^2 + 7150^2 .

It is a cyclic number.

It is not a de Polignac number, because 133405541 - 2¹⁸ = 133143397 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133405541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133405501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66702770 + 66702771.

It is an arithmetic number, because the mean of its divisors is an integer number (66702771).

Almost surely, 2^133405541 is an apocalyptic number.

It is an amenable number.

133405541 is a deficient number, since it is larger than the sum of its proper divisors (1).

133405541 is an equidigital number, since it uses as much as digits as its factorization.

133405541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 133405541 is about 11550.1316442714. The cubic root of 133405541 is about 510.9651606462.

Adding to 133405541 its reverse (145504331), we get a palindrome (278909872).

It can be divided in two parts, 13340 and 5541, that added together give a palindrome (18881).

The spelling of 133405541 in words is "one hundred thirty-three million, four hundred five thousand, five hundred forty-one".