133540061 has 2 divisors, whose sum is σ = 133540062. Its totient is φ = 133540060.

The previous prime is 133540039. The next prime is 133540063. The reversal of 133540061 is 160045331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132112036 + 1428025 = 11494^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 133540061 - 2²² = 129345757 is a prime.

Together with 133540063, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133540063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66770030 + 66770031.

It is an arithmetic number, because the mean of its divisors is an integer number (66770031).

Almost surely, 2^133540061 is an apocalyptic number.

It is an amenable number.

133540061 is a deficient number, since it is larger than the sum of its proper divisors (1).

133540061 is an equidigital number, since it uses as much as digits as its factorization.

133540061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 133540061 is about 11555.9534872723. The cubic root of 133540061 is about 511.1368475261.

Adding to 133540061 its reverse (160045331), we get a palindrome (293585392).

The spelling of 133540061 in words is "one hundred thirty-three million, five hundred forty thousand, sixty-one".