134685521 has 2 divisors, whose sum is σ = 134685522. Its totient is φ = 134685520.

The previous prime is 134685497. The next prime is 134685563. The reversal of 134685521 is 125586431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102921025 + 31764496 = 10145^2 + 5636^2 .

It is an emirp because it is prime and its reverse (125586431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 134685521 - 2⁶ = 134685457 is a prime.

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 (134685121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67342760 + 67342761.

It is an arithmetic number, because the mean of its divisors is an integer number (67342761).

Almost surely, 2^134685521 is an apocalyptic number.

It is an amenable number.

134685521 is a deficient number, since it is larger than the sum of its proper divisors (1).

134685521 is an equidigital number, since it uses as much as digits as its factorization.

134685521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 35.

The square root of 134685521 is about 11605.4091267822. The cubic root of 134685521 is about 512.5941398353.

The spelling of 134685521 in words is "one hundred thirty-four million, six hundred eighty-five thousand, five hundred twenty-one".