1909246091 has 4 divisors (see below), whose sum is σ = 1910808432. Its totient is φ = 1907683752.

The previous prime is 1909246069. The next prime is 1909246099. The reversal of 1909246091 is 1906429091.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1909246091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1909246099) 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, 779336 + ... + 781781.

It is an arithmetic number, because the mean of its divisors is an integer number (477702108).

Almost surely, 2^1909246091 is an apocalyptic number.

1909246091 is a deficient number, since it is larger than the sum of its proper divisors (1562341).

1909246091 is a wasteful number, since it uses less digits than its factorization.

1909246091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562340.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 1909246091 is about 43694.9206544651. The cubic root of 1909246091 is about 1240.5681776588.

The spelling of 1909246091 in words is "one billion, nine hundred nine million, two hundred forty-six thousand, ninety-one".