135021673 has 2 divisors, whose sum is σ = 135021674. Its totient is φ = 135021672.

The previous prime is 135021629. The next prime is 135021697. The reversal of 135021673 is 376120531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125731369 + 9290304 = 11213^2 + 3048^2 .

It is an emirp because it is prime and its reverse (376120531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135021673 is a prime.

It is not a weakly prime, because it can be changed into another prime (135021613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67510836 + 67510837.

It is an arithmetic number, because the mean of its divisors is an integer number (67510837).

Almost surely, 2^135021673 is an apocalyptic number.

It is an amenable number.

135021673 is a deficient number, since it is larger than the sum of its proper divisors (1).

135021673 is an equidigital number, since it uses as much as digits as its factorization.

135021673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 135021673 is about 11619.8826586158. The cubic root of 135021673 is about 513.0202346146.

The spelling of 135021673 in words is "one hundred thirty-five million, twenty-one thousand, six hundred seventy-three".