1905667201 has 4 divisors (see below), whose sum is σ = 1906349872. Its totient is φ = 1904984532.

The previous prime is 1905667177. The next prime is 1905667213. The reversal of 1905667201 is 1027665091.

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: 1027665091 = 839 ⋅1224869.

It is a cyclic number.

It is not a de Polignac number, because 1905667201 - 2²⁷ = 1771449473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1905647201) 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, 337131 + ... + 342736.

It is an arithmetic number, because the mean of its divisors is an integer number (476587468).

Almost surely, 2^1905667201 is an apocalyptic number.

It is an amenable number.

1905667201 is a deficient number, since it is larger than the sum of its proper divisors (682671).

1905667201 is an equidigital number, since it uses as much as digits as its factorization.

1905667201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682670.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 1905667201 is about 43653.9482864952. The cubic root of 1905667201 is about 1239.7925426868.

The spelling of 1905667201 in words is "one billion, nine hundred five million, six hundred sixty-seven thousand, two hundred one".