135629561 has 2 divisors, whose sum is σ = 135629562. Its totient is φ = 135629560.

The previous prime is 135629539. The next prime is 135629563. The reversal of 135629561 is 165926531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128686336 + 6943225 = 11344^2 + 2635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135629561 is a prime.

Together with 135629563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (135629563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67814780 + 67814781.

It is an arithmetic number, because the mean of its divisors is an integer number (67814781).

Almost surely, 2^135629561 is an apocalyptic number.

It is an amenable number.

135629561 is a deficient number, since it is larger than the sum of its proper divisors (1).

135629561 is an equidigital number, since it uses as much as digits as its factorization.

135629561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 38.

The square root of 135629561 is about 11646.0105186283. The cubic root of 135629561 is about 513.7889803343.

The spelling of 135629561 in words is "one hundred thirty-five million, six hundred twenty-nine thousand, five hundred sixty-one".