2979778871 has 2 divisors, whose sum is σ = 2979778872. Its totient is φ = 2979778870.

The previous prime is 2979778859. The next prime is 2979778877. The reversal of 2979778871 is 1788779792.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2979778871 - 2²² = 2975584567 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2979778798 and 2979778807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2979778877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1489889435 + 1489889436.

It is an arithmetic number, because the mean of its divisors is an integer number (1489889436).

Almost surely, 2^2979778871 is an apocalyptic number.

2979778871 is a deficient number, since it is larger than the sum of its proper divisors (1).

2979778871 is an equidigital number, since it uses as much as digits as its factorization.

2979778871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24893568, while the sum is 65.

The square root of 2979778871 is about 54587.3508333204. The cubic root of 2979778871 is about 1439.0018273805.

The spelling of 2979778871 in words is "two billion, nine hundred seventy-nine million, seven hundred seventy-eight thousand, eight hundred seventy-one".