135661523 has 2 divisors, whose sum is σ = 135661524. Its totient is φ = 135661522.

The previous prime is 135661481. The next prime is 135661541. The reversal of 135661523 is 325166531.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 135661523 - 2⁶ = 135661459 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135661523.

It is not a weakly prime, because it can be changed into another prime (135661553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67830761 + 67830762.

It is an arithmetic number, because the mean of its divisors is an integer number (67830762).

Almost surely, 2^135661523 is an apocalyptic number.

135661523 is a deficient number, since it is larger than the sum of its proper divisors (1).

135661523 is an equidigital number, since it uses as much as digits as its factorization.

135661523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 32.

The square root of 135661523 is about 11647.3826673635. The cubic root of 135661523 is about 513.8293364176.

The spelling of 135661523 in words is "one hundred thirty-five million, six hundred sixty-one thousand, five hundred twenty-three".