135023545621 has 2 divisors, whose sum is σ = 135023545622. Its totient is φ = 135023545620.

The previous prime is 135023545583. The next prime is 135023545691. The reversal of 135023545621 is 126545320531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128945628100 + 6077917521 = 359090^2 + 77961^2 .

It is a cyclic number.

It is not a de Polignac number, because 135023545621 - 2²⁷ = 134889327893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135023545691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67511772810 + 67511772811.

It is an arithmetic number, because the mean of its divisors is an integer number (67511772811).

Almost surely, 2^135023545621 is an apocalyptic number.

It is an amenable number.

135023545621 is a deficient number, since it is larger than the sum of its proper divisors (1).

135023545621 is an equidigital number, since it uses as much as digits as its factorization.

135023545621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 135023545621 in words is "one hundred thirty-five billion, twenty-three million, five hundred forty-five thousand, six hundred twenty-one".