2978991811 has 8 divisors (see below), whose sum is σ = 3031045920. Its totient is φ = 2927241792.

The previous prime is 2978991793. The next prime is 2978991857. The reversal of 2978991811 is 1181998792.

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

It is a cyclic number.

It is not a de Polignac number, because 2978991811 - 2¹¹ = 2978989763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2978991881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56215 + ... + 95488.

It is an arithmetic number, because the mean of its divisors is an integer number (378880740).

Almost surely, 2^2978991811 is an apocalyptic number.

2978991811 is a deficient number, since it is larger than the sum of its proper divisors (52054109).

2978991811 is a wasteful number, since it uses less digits than its factorization.

2978991811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152045.

The product of its digits is 653184, while the sum is 55.

The square root of 2978991811 is about 54580.1411779046. The cubic root of 2978991811 is about 1438.8751199346.

The spelling of 2978991811 in words is "two billion, nine hundred seventy-eight million, nine hundred ninety-one thousand, eight hundred eleven".