205425801 has 20 divisors (see below), whose sum is σ = 350710272. Its totient is φ = 117385848.

The previous prime is 205425797. The next prime is 205425817. The reversal of 205425801 is 108524502.

It is a happy number.

It is not a de Polignac number, because 205425801 - 2² = 205425797 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (205425851) 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 19 ways as a sum of consecutive naturals, for example, 180585 + ... + 181718.

Almost surely, 2^205425801 is an apocalyptic number.

205425801 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

205425801 is a deficient number, since it is larger than the sum of its proper divisors (145284471).

205425801 is an equidigital number, since it uses as much as digits as its factorization.

205425801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362322 (or 362313 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 205425801 is about 14332.6829658651. The cubic root of 205425801 is about 590.0448122623.

The spelling of 205425801 in words is "two hundred five million, four hundred twenty-five thousand, eight hundred one".