135856969 has 2 divisors, whose sum is σ = 135856970. Its totient is φ = 135856968.

The previous prime is 135856957. The next prime is 135856991. The reversal of 135856969 is 969658531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69222400 + 66634569 = 8320^2 + 8163^2 .

It is a cyclic number.

It is not a de Polignac number, because 135856969 - 2⁷ = 135856841 is a prime.

It is a super-2 number, since 2×135856969² = 36914232051733922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (135853969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67928484 + 67928485.

It is an arithmetic number, because the mean of its divisors is an integer number (67928485).

Almost surely, 2^135856969 is an apocalyptic number.

It is an amenable number.

135856969 is a deficient number, since it is larger than the sum of its proper divisors (1).

135856969 is an equidigital number, since it uses as much as digits as its factorization.

135856969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1749600, while the sum is 52.

The square root of 135856969 is about 11655.7697729494. The cubic root of 135856969 is about 514.0759740231.

The spelling of 135856969 in words is "one hundred thirty-five million, eight hundred fifty-six thousand, nine hundred sixty-nine".