2091444869 has 16 divisors (see below), whose sum is σ = 2200531968. Its totient is φ = 1985398272.

The previous prime is 2091444857. The next prime is 2091444889. The reversal of 2091444869 is 9684441902.

It is a cyclic number.

It is not a de Polignac number, because 2091444869 - 2¹⁶ = 2091379333 is a prime.

It is a super-2 number, since 2×2091444869² = 8748283280132854322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091444829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 612164 + ... + 615570.

It is an arithmetic number, because the mean of its divisors is an integer number (137533248).

Almost surely, 2^2091444869 is an apocalyptic number.

It is an amenable number.

2091444869 is a deficient number, since it is larger than the sum of its proper divisors (109087099).

2091444869 is a wasteful number, since it uses less digits than its factorization.

2091444869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3844.

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 2091444869 is about 45732.3175555318. The cubic root of 2091444869 is about 1278.8378263515.

The spelling of 2091444869 in words is "two billion, ninety-one million, four hundred forty-four thousand, eight hundred sixty-nine".