203120130809 has 2 divisors, whose sum is σ = 203120130810. Its totient is φ = 203120130808.

The previous prime is 203120130803. The next prime is 203120130827. The reversal of 203120130809 is 908031021302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108539279209 + 94580851600 = 329453^2 + 307540^2 .

It is a cyclic number.

It is not a de Polignac number, because 203120130809 - 2¹⁶ = 203120065273 is a prime.

It is not a weakly prime, because it can be changed into another prime (203120130803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101560065404 + 101560065405.

It is an arithmetic number, because the mean of its divisors is an integer number (101560065405).

Almost surely, 2^203120130809 is an apocalyptic number.

It is an amenable number.

203120130809 is a deficient number, since it is larger than the sum of its proper divisors (1).

203120130809 is an equidigital number, since it uses as much as digits as its factorization.

203120130809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 203120130809 in words is "two hundred three billion, one hundred twenty million, one hundred thirty thousand, eight hundred nine".