1945449049 has 4 divisors (see below), whose sum is σ = 1946945700. Its totient is φ = 1943952400.

The previous prime is 1945449041. The next prime is 1945449053. The reversal of 1945449049 is 9409445491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9409445491 = 1823 ⋅5161517.

It can be written as a sum of positive squares in 2 ways, for example, as 87235600 + 1858213449 = 9340^2 + 43107^2 .

It is a cyclic number.

It is not a de Polignac number, because 1945449049 - 2³ = 1945449041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1945448993 and 1945449011.

It is not an unprimeable number, because it can be changed into a prime (1945449041) 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, 746374 + ... + 748975.

It is an arithmetic number, because the mean of its divisors is an integer number (486736425).

Almost surely, 2^1945449049 is an apocalyptic number.

It is an amenable number.

1945449049 is a deficient number, since it is larger than the sum of its proper divisors (1496651).

1945449049 is a wasteful number, since it uses less digits than its factorization.

1945449049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496650.

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 1945449049 is about 44107.2448584130. The cubic root of 1945449049 is about 1248.3603138706.

The spelling of 1945449049 in words is "one billion, nine hundred forty-five million, four hundred forty-nine thousand, forty-nine".