1909253649 has 8 divisors (see below), whose sum is σ = 2545956000. Its totient is φ = 1272693536.

The previous prime is 1909253639. The next prime is 1909253653. The reversal of 1909253649 is 9463529091.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1909253649 - 2²⁰ = 1908205073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1909253598 and 1909253607.

It is not an unprimeable number, because it can be changed into a prime (1909253639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1189 + ... + 61805.

It is an arithmetic number, because the mean of its divisors is an integer number (318244500).

Almost surely, 2^1909253649 is an apocalyptic number.

It is an amenable number.

1909253649 is a deficient number, since it is larger than the sum of its proper divisors (636702351).

1909253649 is a wasteful number, since it uses less digits than its factorization.

1909253649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71119.

The product of its (nonzero) digits is 524880, while the sum is 48.

The square root of 1909253649 is about 43695.0071404045. The cubic root of 1909253649 is about 1240.5698146403.

The spelling of 1909253649 in words is "one billion, nine hundred nine million, two hundred fifty-three thousand, six hundred forty-nine".