205506001 has 4 divisors (see below), whose sum is σ = 206167104. Its totient is φ = 204844900.

The previous prime is 205505941. The next prime is 205506061. The reversal of 205506001 is 100605502.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (205505941) and next prime (205506061).

It is a cyclic number.

It is not a de Polignac number, because 205506001 - 2¹¹ = 205503953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205506001.

It is not an unprimeable number, because it can be changed into a prime (205506061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330085 + ... + 330706.

It is an arithmetic number, because the mean of its divisors is an integer number (51541776).

Almost surely, 2^205506001 is an apocalyptic number.

It is an amenable number.

205506001 is a deficient number, since it is larger than the sum of its proper divisors (661103).

205506001 is an equidigital number, since it uses as much as digits as its factorization.

205506001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661102.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 205506001 is about 14335.4804942143. The cubic root of 205506001 is about 590.1215884621.

The spelling of 205506001 in words is "two hundred five million, five hundred six thousand, one".