135507523 has 2 divisors, whose sum is σ = 135507524. Its totient is φ = 135507522.

The previous prime is 135507499. The next prime is 135507529. The reversal of 135507523 is 325705531.

It is a strong prime.

It is an emirp because it is prime and its reverse (325705531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135507523 - 2²¹ = 133410371 is a prime.

It is not a weakly prime, because it can be changed into another prime (135507529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67753761 + 67753762.

It is an arithmetic number, because the mean of its divisors is an integer number (67753762).

Almost surely, 2^135507523 is an apocalyptic number.

135507523 is a deficient number, since it is larger than the sum of its proper divisors (1).

135507523 is an equidigital number, since it uses as much as digits as its factorization.

135507523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15750, while the sum is 31.

The square root of 135507523 is about 11640.7698628570. The cubic root of 135507523 is about 513.6348335179.

The spelling of 135507523 in words is "one hundred thirty-five million, five hundred seven thousand, five hundred twenty-three".