133219987 has 4 divisors (see below), whose sum is σ = 133910440. Its totient is φ = 132529536.

The previous prime is 133219981. The next prime is 133219993. The reversal of 133219987 is 789912331.

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

It is an interprime number because it is at equal distance from previous prime (133219981) and next prime (133219993).

It is a cyclic number.

It is not a de Polignac number, because 133219987 - 2⁷ = 133219859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133219981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344937 + ... + 345322.

It is an arithmetic number, because the mean of its divisors is an integer number (33477610).

Almost surely, 2^133219987 is an apocalyptic number.

133219987 is a deficient number, since it is larger than the sum of its proper divisors (690453).

133219987 is an equidigital number, since it uses as much as digits as its factorization.

133219987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690452.

The product of its digits is 81648, while the sum is 43.

The square root of 133219987 is about 11542.0963000661. The cubic root of 133219987 is about 510.7281499479.

The spelling of 133219987 in words is "one hundred thirty-three million, two hundred nineteen thousand, nine hundred eighty-seven".