1909455091 has 8 divisors (see below), whose sum is σ = 1979873280. Its totient is φ = 1839341952.

The previous prime is 1909455071. The next prime is 1909455109. The reversal of 1909455091 is 1905549091.

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 1909455091 - 2¹³ = 1909446899 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (1909455061) 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, 63475 + ... + 88588.

It is an arithmetic number, because the mean of its divisors is an integer number (247484160).

Almost surely, 2^1909455091 is an apocalyptic number.

1909455091 is a deficient number, since it is larger than the sum of its proper divisors (70418189).

1909455091 is a wasteful number, since it uses less digits than its factorization.

1909455091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152525.

The product of its (nonzero) digits is 72900, while the sum is 43.

The square root of 1909455091 is about 43697.3121713453. The cubic root of 1909455091 is about 1240.6134432202.

The spelling of 1909455091 in words is "one billion, nine hundred nine million, four hundred fifty-five thousand, ninety-one".