2891639541 has 8 divisors (see below), whose sum is σ = 4406307904. Its totient is φ = 1652365440.

The previous prime is 2891639537. The next prime is 2891639551. The reversal of 2891639541 is 1459361982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2891639541 - 2² = 2891639537 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2891639551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68848540 + ... + 68848581.

It is an arithmetic number, because the mean of its divisors is an integer number (550788488).

Almost surely, 2^2891639541 is an apocalyptic number.

2891639541 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2891639541 is a deficient number, since it is larger than the sum of its proper divisors (1514668363).

2891639541 is a wasteful number, since it uses less digits than its factorization.

2891639541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137697131.

The product of its digits is 466560, while the sum is 48.

The square root of 2891639541 is about 53773.9671309454. The cubic root of 2891639541 is about 1424.6714401629.

The spelling of 2891639541 in words is "two billion, eight hundred ninety-one million, six hundred thirty-nine thousand, five hundred forty-one".