135208545971 has 2 divisors, whose sum is σ = 135208545972. Its totient is φ = 135208545970.

The previous prime is 135208545919. The next prime is 135208546021. The reversal of 135208545971 is 179545802531.

It is an a-pointer prime, because the next prime (135208546021) can be obtained adding 135208545971 to its sum of digits (50).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135208545971 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (135208545071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67604272985 + 67604272986.

It is an arithmetic number, because the mean of its divisors is an integer number (67604272986).

Almost surely, 2^135208545971 is an apocalyptic number.

135208545971 is a deficient number, since it is larger than the sum of its proper divisors (1).

135208545971 is an equidigital number, since it uses as much as digits as its factorization.

135208545971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512000, while the sum is 50.

The spelling of 135208545971 in words is "one hundred thirty-five billion, two hundred eight million, five hundred forty-five thousand, nine hundred seventy-one".