133218986 has 4 divisors (see below), whose sum is σ = 199828482. Its totient is φ = 66609492.

The previous prime is 133218983. The next prime is 133219007. The reversal of 133218986 is 689812331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 132963961 + 255025 = 11531^2 + 505^2 .

It is not an unprimeable number, because it can be changed into a prime (133218983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33304745 + ... + 33304748.

Almost surely, 2^133218986 is an apocalyptic number.

133218986 is a deficient number, since it is larger than the sum of its proper divisors (66609496).

133218986 is an equidigital number, since it uses as much as digits as its factorization.

133218986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66609495.

The product of its digits is 62208, while the sum is 41.

The square root of 133218986 is about 11542.0529369779. The cubic root of 133218986 is about 510.7268707601.

The spelling of 133218986 in words is "one hundred thirty-three million, two hundred eighteen thousand, nine hundred eighty-six".