133040981 has 2 divisors, whose sum is σ = 133040982. Its totient is φ = 133040980.

The previous prime is 133040969. The next prime is 133040987. The reversal of 133040981 is 189040331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126202756 + 6838225 = 11234^2 + 2615^2 .

It is an emirp because it is prime and its reverse (189040331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133040981 - 2²² = 128846677 is a prime.

It is a super-2 number, since 2×133040981² = 35399805250884722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133040987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66520490 + 66520491.

It is an arithmetic number, because the mean of its divisors is an integer number (66520491).

Almost surely, 2^133040981 is an apocalyptic number.

It is an amenable number.

133040981 is a deficient number, since it is larger than the sum of its proper divisors (1).

133040981 is an equidigital number, since it uses as much as digits as its factorization.

133040981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 133040981 is about 11534.3392095083. The cubic root of 133040981 is about 510.4992944435.

The spelling of 133040981 in words is "one hundred thirty-three million, forty thousand, nine hundred eighty-one".