1905000001 has 4 divisors (see below), whose sum is σ = 1987826112. Its totient is φ = 1822173892.

The previous prime is 1904999977. The next prime is 1905000007. The reversal of 1905000001 is 1000005091.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1000005091 = 4801 ⋅208291.

It is a cyclic number.

It is not a de Polignac number, because 1905000001 - 2¹⁷ = 1904868929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1905000007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41413021 + ... + 41413066.

It is an arithmetic number, because the mean of its divisors is an integer number (496956528).

Almost surely, 2^1905000001 is an apocalyptic number.

It is an amenable number.

1905000001 is a deficient number, since it is larger than the sum of its proper divisors (82826111).

1905000001 is an equidigital number, since it uses as much as digits as its factorization.

1905000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82826110.

The product of its (nonzero) digits is 45, while the sum is 16.

The square root of 1905000001 is about 43646.3056970461. The cubic root of 1905000001 is about 1239.6478363884.

Adding to 1905000001 its reverse (1000005091), we get a palindrome (2905005092).

The spelling of 1905000001 in words is "one billion, nine hundred five million, one", and thus it is an aban number.