133211987 has 2 divisors, whose sum is σ = 133211988. Its totient is φ = 133211986.

The previous prime is 133211977. The next prime is 133211989. The reversal of 133211987 is 789112331.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133211987 - 2¹² = 133207891 is a prime.

Together with 133211989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133211989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66605993 + 66605994.

It is an arithmetic number, because the mean of its divisors is an integer number (66605994).

Almost surely, 2^133211987 is an apocalyptic number.

133211987 is a deficient number, since it is larger than the sum of its proper divisors (1).

133211987 is an equidigital number, since it uses as much as digits as its factorization.

133211987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 35.

The square root of 133211987 is about 11541.7497373665. The cubic root of 133211987 is about 510.7179264895.

The spelling of 133211987 in words is "one hundred thirty-three million, two hundred eleven thousand, nine hundred eighty-seven".