133720549 has 2 divisors, whose sum is σ = 133720550. Its totient is φ = 133720548.

The previous prime is 133720547. The next prime is 133720571. The reversal of 133720549 is 945027331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122544900 + 11175649 = 11070^2 + 3343^2 .

It is a cyclic number.

It is not a de Polignac number, because 133720549 - 2¹ = 133720547 is a prime.

It is a super-2 number, since 2×133720549² = 35762370449722802, which contains 22 as substring.

Together with 133720547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133720547) 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, 66860274 + 66860275.

It is an arithmetic number, because the mean of its divisors is an integer number (66860275).

Almost surely, 2^133720549 is an apocalyptic number.

It is an amenable number.

133720549 is a deficient number, since it is larger than the sum of its proper divisors (1).

133720549 is an equidigital number, since it uses as much as digits as its factorization.

133720549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 133720549 is about 11563.7601583568. The cubic root of 133720549 is about 511.3670219905.

The spelling of 133720549 in words is "one hundred thirty-three million, seven hundred twenty thousand, five hundred forty-nine".