133181497 has 2 divisors, whose sum is σ = 133181498. Its totient is φ = 133181496.

The previous prime is 133181479. The next prime is 133181501. The reversal of 133181497 is 794181331.

Together with previous prime (133181479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130782096 + 2399401 = 11436^2 + 1549^2 .

It is an emirp because it is prime and its reverse (794181331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133181497 is a prime.

It is a super-2 number, since 2×133181497² = 35474622286322018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (133121497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66590748 + 66590749.

It is an arithmetic number, because the mean of its divisors is an integer number (66590749).

Almost surely, 2^133181497 is an apocalyptic number.

It is an amenable number.

133181497 is a deficient number, since it is larger than the sum of its proper divisors (1).

133181497 is an equidigital number, since it uses as much as digits as its factorization.

133181497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 133181497 is about 11540.4288048582. The cubic root of 133181497 is about 510.6789585805.

It can be divided in two parts, 1331 and 81497, that added together give a palindrome (82828).

The spelling of 133181497 in words is "one hundred thirty-three million, one hundred eighty-one thousand, four hundred ninety-seven".