135775649 has 2 divisors, whose sum is σ = 135775650. Its totient is φ = 135775648.

The previous prime is 135775637. The next prime is 135775657. The reversal of 135775649 is 946577531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130690624 + 5085025 = 11432^2 + 2255^2 .

It is an emirp because it is prime and its reverse (946577531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135775649 is a prime.

It is a super-2 number, since 2×135775649² = 36870053722742402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (135775609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67887824 + 67887825.

It is an arithmetic number, because the mean of its divisors is an integer number (67887825).

Almost surely, 2^135775649 is an apocalyptic number.

It is an amenable number.

135775649 is a deficient number, since it is larger than the sum of its proper divisors (1).

135775649 is an equidigital number, since it uses as much as digits as its factorization.

135775649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793800, while the sum is 47.

The square root of 135775649 is about 11652.2808496878. The cubic root of 135775649 is about 513.9733832806.

The spelling of 135775649 in words is "one hundred thirty-five million, seven hundred seventy-five thousand, six hundred forty-nine".