2891540389 has 4 divisors (see below), whose sum is σ = 2917129356. Its totient is φ = 2865951424.

The previous prime is 2891540363. The next prime is 2891540401. The reversal of 2891540389 is 9830451982.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1090980900 + 1800559489 = 33030^2 + 42433^2 .

It is a cyclic number.

It is not a de Polignac number, because 2891540389 - 2⁵ = 2891540357 is a prime.

It is a super-2 number, since 2×2891540389² = 16722011642436542642, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2891540789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12794314 + ... + 12794539.

It is an arithmetic number, because the mean of its divisors is an integer number (729282339).

Almost surely, 2^2891540389 is an apocalyptic number.

It is an amenable number.

2891540389 is a deficient number, since it is larger than the sum of its proper divisors (25588967).

2891540389 is a wasteful number, since it uses less digits than its factorization.

2891540389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25588966.

The product of its (nonzero) digits is 622080, while the sum is 49.

The square root of 2891540389 is about 53773.0451899462. The cubic root of 2891540389 is about 1424.6551563632.

The spelling of 2891540389 in words is "two billion, eight hundred ninety-one million, five hundred forty thousand, three hundred eighty-nine".