133544981 has 2 divisors, whose sum is σ = 133544982. Its totient is φ = 133544980.

The previous prime is 133544897. The next prime is 133544987. The reversal of 133544981 is 189445331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123965956 + 9579025 = 11134^2 + 3095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133544981 is a prime.

It is a super-2 number, since 2×133544981² = 35668523900580722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133544987) 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, 66772490 + 66772491.

It is an arithmetic number, because the mean of its divisors is an integer number (66772491).

Almost surely, 2^133544981 is an apocalyptic number.

It is an amenable number.

133544981 is a deficient number, since it is larger than the sum of its proper divisors (1).

133544981 is an equidigital number, since it uses as much as digits as its factorization.

133544981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 133544981 is about 11556.1663625962. The cubic root of 133544981 is about 511.1431246996.

The spelling of 133544981 in words is "one hundred thirty-three million, five hundred forty-four thousand, nine hundred eighty-one".