205120801 has 4 divisors (see below), whose sum is σ = 205900992. Its totient is φ = 204340612.

The previous prime is 205120763. The next prime is 205120813. The reversal of 205120801 is 108021502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205120801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205120871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389701 + ... + 390226.

It is an arithmetic number, because the mean of its divisors is an integer number (51475248).

Almost surely, 2^205120801 is an apocalyptic number.

It is an amenable number.

205120801 is a deficient number, since it is larger than the sum of its proper divisors (780191).

205120801 is an equidigital number, since it uses as much as digits as its factorization.

205120801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780190.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 205120801 is about 14322.0389958972. The cubic root of 205120801 is about 589.7526503143.

The spelling of 205120801 in words is "two hundred five million, one hundred twenty thousand, eight hundred one".