134557561 has 2 divisors, whose sum is σ = 134557562. Its totient is φ = 134557560.

The previous prime is 134557559. The next prime is 134557573. The reversal of 134557561 is 165755431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72777961 + 61779600 = 8531^2 + 7860^2 .

It is a cyclic number.

It is not a de Polignac number, because 134557561 - 2¹ = 134557559 is a prime.

Together with 134557559, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 134557561.

It is not a weakly prime, because it can be changed into another prime (134557961) 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, 67278780 + 67278781.

It is an arithmetic number, because the mean of its divisors is an integer number (67278781).

Almost surely, 2^134557561 is an apocalyptic number.

It is an amenable number.

134557561 is a deficient number, since it is larger than the sum of its proper divisors (1).

134557561 is an equidigital number, since it uses as much as digits as its factorization.

134557561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63000, while the sum is 37.

The square root of 134557561 is about 11599.8948702133. The cubic root of 134557561 is about 512.4317558149.

The spelling of 134557561 in words is "one hundred thirty-four million, five hundred fifty-seven thousand, five hundred sixty-one".