133615969 has 2 divisors, whose sum is σ = 133615970. Its totient is φ = 133615968.

The previous prime is 133615957. The next prime is 133615987. The reversal of 133615969 is 969516331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85840225 + 47775744 = 9265^2 + 6912^2 .

It is a cyclic number.

It is not a de Polignac number, because 133615969 - 2⁹ = 133615457 is a prime.

It is a super-2 number, since 2×133615969² = 35706454343617922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (133610969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66807984 + 66807985.

It is an arithmetic number, because the mean of its divisors is an integer number (66807985).

Almost surely, 2^133615969 is an apocalyptic number.

It is an amenable number.

133615969 is a deficient number, since it is larger than the sum of its proper divisors (1).

133615969 is an equidigital number, since it uses as much as digits as its factorization.

133615969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131220, while the sum is 43.

The square root of 133615969 is about 11559.2373883401. The cubic root of 133615969 is about 511.2336774618.

The spelling of 133615969 in words is "one hundred thirty-three million, six hundred fifteen thousand, nine hundred sixty-nine".