1905222649 has 4 divisors (see below), whose sum is σ = 2078424720. Its totient is φ = 1732020580.

The previous prime is 1905222647. The next prime is 1905222667. The reversal of 1905222649 is 9462225091.

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 not a de Polignac number, because 1905222649 - 2¹ = 1905222647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1905222643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86601019 + ... + 86601040.

It is an arithmetic number, because the mean of its divisors is an integer number (519606180).

Almost surely, 2^1905222649 is an apocalyptic number.

It is an amenable number.

1905222649 is a deficient number, since it is larger than the sum of its proper divisors (173202071).

1905222649 is a wasteful number, since it uses less digits than its factorization.

1905222649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173202070.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 1905222649 is about 43648.8562164004. The cubic root of 1905222649 is about 1239.6961293646.

The spelling of 1905222649 in words is "one billion, nine hundred five million, two hundred twenty-two thousand, six hundred forty-nine".