133987969 has 2 divisors, whose sum is σ = 133987970. Its totient is φ = 133987968.

The previous prime is 133987951. The next prime is 133988003. The reversal of 133987969 is 969789331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90954369 + 43033600 = 9537^2 + 6560^2 .

It is a cyclic number.

It is not a de Polignac number, because 133987969 - 2⁵ = 133987937 is a prime.

It is a super-2 number, since 2×133987969² = 35905551673489922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (133987939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66993984 + 66993985.

It is an arithmetic number, because the mean of its divisors is an integer number (66993985).

Almost surely, 2^133987969 is an apocalyptic number.

It is an amenable number.

133987969 is a deficient number, since it is larger than the sum of its proper divisors (1).

133987969 is an equidigital number, since it uses as much as digits as its factorization.

133987969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 55.

The square root of 133987969 is about 11575.3172310741. The cubic root of 133987969 is about 511.7076794583.

The spelling of 133987969 in words is "one hundred thirty-three million, nine hundred eighty-seven thousand, nine hundred sixty-nine".