133553081 has 2 divisors, whose sum is σ = 133553082. Its totient is φ = 133553080.

The previous prime is 133553027. The next prime is 133553087. The reversal of 133553081 is 180355331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101687056 + 31866025 = 10084^2 + 5645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133553081 is a prime.

It is a super-2 number, since 2×133553081² = 35672850889185122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (133553087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66776540 + 66776541.

It is an arithmetic number, because the mean of its divisors is an integer number (66776541).

Almost surely, 2^133553081 is an apocalyptic number.

It is an amenable number.

133553081 is a deficient number, since it is larger than the sum of its proper divisors (1).

133553081 is an equidigital number, since it uses as much as digits as its factorization.

133553081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 133553081 is about 11556.5168195265. The cubic root of 133553081 is about 511.1534587348.

The spelling of 133553081 in words is "one hundred thirty-three million, five hundred fifty-three thousand, eighty-one".