133542641 has 2 divisors, whose sum is σ = 133542642. Its totient is φ = 133542640.

The previous prime is 133542589. The next prime is 133542691. The reversal of 133542641 is 146245331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87030241 + 46512400 = 9329^2 + 6820^2 .

It is an emirp because it is prime and its reverse (146245331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133542641 - 2¹⁴ = 133526257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133542691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66771320 + 66771321.

It is an arithmetic number, because the mean of its divisors is an integer number (66771321).

Almost surely, 2^133542641 is an apocalyptic number.

It is an amenable number.

133542641 is a deficient number, since it is larger than the sum of its proper divisors (1).

133542641 is an equidigital number, since it uses as much as digits as its factorization.

133542641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 133542641 is about 11556.0651175043. The cubic root of 133542641 is about 511.1401392339.

Adding to 133542641 its reverse (146245331), we get a palindrome (279787972).

The spelling of 133542641 in words is "one hundred thirty-three million, five hundred forty-two thousand, six hundred forty-one".