133219981 has 2 divisors, whose sum is σ = 133219982. Its totient is φ = 133219980.

The previous prime is 133219969. The next prime is 133219993. The reversal of 133219981 is 189912331.

It is a balanced prime because it is at equal distance from previous prime (133219969) and next prime (133219993).

It can be written as a sum of positive squares in only one way, i.e., 114297481 + 18922500 = 10691^2 + 4350^2 .

It is a cyclic number.

It is not a de Polignac number, because 133219981 - 2¹⁵ = 133187213 is a prime.

It is a super-2 number, since 2×133219981² = 35495126675280722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 133219981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133219921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66609990 + 66609991.

It is an arithmetic number, because the mean of its divisors is an integer number (66609991).

Almost surely, 2^133219981 is an apocalyptic number.

It is an amenable number.

133219981 is a deficient number, since it is larger than the sum of its proper divisors (1).

133219981 is an equidigital number, since it uses as much as digits as its factorization.

133219981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 37.

The square root of 133219981 is about 11542.0960401480. The cubic root of 133219981 is about 510.7281422805.

The spelling of 133219981 in words is "one hundred thirty-three million, two hundred nineteen thousand, nine hundred eighty-one".