135220973 has 2 divisors, whose sum is σ = 135220974. Its totient is φ = 135220972.

The previous prime is 135220961. The next prime is 135221033. The reversal of 135220973 is 379022531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134977924 + 243049 = 11618^2 + 493^2 .

It is a cyclic number.

It is not a de Polignac number, because 135220973 - 2¹⁰ = 135219949 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135220373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67610486 + 67610487.

It is an arithmetic number, because the mean of its divisors is an integer number (67610487).

Almost surely, 2^135220973 is an apocalyptic number.

It is an amenable number.

135220973 is a deficient number, since it is larger than the sum of its proper divisors (1).

135220973 is an equidigital number, since it uses as much as digits as its factorization.

135220973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 135220973 is about 11628.4553144431. The cubic root of 135220973 is about 513.2725266237.

The spelling of 135220973 in words is "one hundred thirty-five million, two hundred twenty thousand, nine hundred seventy-three".