133530251 has 2 divisors, whose sum is σ = 133530252. Its totient is φ = 133530250.

The previous prime is 133530247. The next prime is 133530259. The reversal of 133530251 is 152035331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 133530251 - 2² = 133530247 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133530259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66765125 + 66765126.

It is an arithmetic number, because the mean of its divisors is an integer number (66765126).

Almost surely, 2^133530251 is an apocalyptic number.

133530251 is a deficient number, since it is larger than the sum of its proper divisors (1).

133530251 is an equidigital number, since it uses as much as digits as its factorization.

133530251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 133530251 is about 11555.5290229396. The cubic root of 133530251 is about 511.1243309943.

Adding to 133530251 its reverse (152035331), we get a palindrome (285565582).

The spelling of 133530251 in words is "one hundred thirty-three million, five hundred thirty thousand, two hundred fifty-one".