135815623 has 2 divisors, whose sum is σ = 135815624. Its totient is φ = 135815622.

The previous prime is 135815611. The next prime is 135815651. The reversal of 135815623 is 326518531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 135815623 - 2⁹ = 135815111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135815653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67907811 + 67907812.

It is an arithmetic number, because the mean of its divisors is an integer number (67907812).

Almost surely, 2^135815623 is an apocalyptic number.

135815623 is a deficient number, since it is larger than the sum of its proper divisors (1).

135815623 is an equidigital number, since it uses as much as digits as its factorization.

135815623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 34.

The square root of 135815623 is about 11653.9960099530. The cubic root of 135815623 is about 514.0238183333.

The spelling of 135815623 in words is "one hundred thirty-five million, eight hundred fifteen thousand, six hundred twenty-three".