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133000081 is a prime number
BaseRepresentation
bin1111110110101…
…10101110010001
3100021021002210221
413323112232101
5233022000311
621110353041
73203324224
oct773265621
9307232727
10133000081
1169090a25
123865b781
1321729196
14139415bb
15ba22671
hex7ed6b91

133000081 has 2 divisors, whose sum is σ = 133000082. Its totient is φ = 133000080.

The previous prime is 133000079. The next prime is 133000097. The reversal of 133000081 is 180000331.

It is an a-pointer prime, because the next prime (133000097) can be obtained adding 133000081 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82519056 + 50481025 = 9084^2 + 7105^2 .

It is a cyclic number.

It is not a de Polignac number, because 133000081 - 21 = 133000079 is a prime.

It is a super-2 number, since 2×1330000812 = 35378043092013122, which contains 22 as substring.

Together with 133000079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (133000001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66500040 + 66500041.

It is an arithmetic number, because the mean of its divisors is an integer number (66500041).

Almost surely, 2133000081 is an apocalyptic number.

It is an amenable number.

133000081 is a deficient number, since it is larger than the sum of its proper divisors (1).

133000081 is an equidigital number, since it uses as much as digits as its factorization.

133000081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 133000081 is about 11532.5661064656. The cubic root of 133000081 is about 510.4469758247.

The spelling of 133000081 in words is "one hundred thirty-three million, eighty-one", and thus it is an aban number.