133261987 has 2 divisors, whose sum is σ = 133261988. Its totient is φ = 133261986.

The previous prime is 133261979. The next prime is 133262027. The reversal of 133261987 is 789162331.

It is an a-pointer prime, because the next prime (133262027) can be obtained adding 133261987 to its sum of digits (40).

It is a weak prime.

It is an emirp because it is prime and its reverse (789162331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133261987 - 2³ = 133261979 is a prime.

It is not a weakly prime, because it can be changed into another prime (133261937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66630993 + 66630994.

It is an arithmetic number, because the mean of its divisors is an integer number (66630994).

Almost surely, 2^133261987 is an apocalyptic number.

133261987 is a deficient number, since it is larger than the sum of its proper divisors (1).

133261987 is an equidigital number, since it uses as much as digits as its factorization.

133261987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 133261987 is about 11543.9155835444. The cubic root of 133261987 is about 510.7818163908.

The spelling of 133261987 in words is "one hundred thirty-three million, two hundred sixty-one thousand, nine hundred eighty-seven".