135121603 has 2 divisors, whose sum is σ = 135121604. Its totient is φ = 135121602.

The previous prime is 135121561. The next prime is 135121631. The reversal of 135121603 is 306121531.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135121603 is a prime.

It is not a weakly prime, because it can be changed into another prime (135121703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67560801 + 67560802.

It is an arithmetic number, because the mean of its divisors is an integer number (67560802).

Almost surely, 2^135121603 is an apocalyptic number.

135121603 is a deficient number, since it is larger than the sum of its proper divisors (1).

135121603 is an equidigital number, since it uses as much as digits as its factorization.

135121603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 135121603 is about 11624.1818206702. The cubic root of 135121603 is about 513.1467660785.

The spelling of 135121603 in words is "one hundred thirty-five million, one hundred twenty-one thousand, six hundred three".