2019891385 has 16 divisors (see below), whose sum is σ = 2478867984. Its totient is φ = 1579640832.

The previous prime is 2019891371. The next prime is 2019891437. The reversal of 2019891385 is 5831989102.

It can be written as a sum of positive squares in 8 ways, for example, as 727704576 + 1292186809 = 26976^2 + 35947^2 .

It is a cyclic number.

It is not a de Polignac number, because 2019891385 - 2¹³ = 2019883193 is a prime.

It is a super-2 number, since 2×2019891385² = 8159922414394436450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16759 + ... + 65731.

It is an arithmetic number, because the mean of its divisors is an integer number (154929249).

Almost surely, 2^2019891385 is an apocalyptic number.

It is an amenable number.

2019891385 is a deficient number, since it is larger than the sum of its proper divisors (458976599).

2019891385 is a wasteful number, since it uses less digits than its factorization.

2019891385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49164.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 2019891385 is about 44943.2017662293. The cubic root of 2019891385 is about 1264.0842075319.

The spelling of 2019891385 in words is "two billion, nineteen million, eight hundred ninety-one thousand, three hundred eighty-five".