1978876411 has 2 divisors, whose sum is σ = 1978876412. Its totient is φ = 1978876410.

The previous prime is 1978876409. The next prime is 1978876433. The reversal of 1978876411 is 1146788791.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1978876411 - 2¹ = 1978876409 is a prime.

Together with 1978876409, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1978876441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989438205 + 989438206.

It is an arithmetic number, because the mean of its divisors is an integer number (989438206).

Almost surely, 2^1978876411 is an apocalyptic number.

1978876411 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978876411 is an equidigital number, since it uses as much as digits as its factorization.

1978876411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 52.

The square root of 1978876411 is about 44484.5637384475. The cubic root of 1978876411 is about 1255.4696656436.

The spelling of 1978876411 in words is "one billion, nine hundred seventy-eight million, eight hundred seventy-six thousand, four hundred eleven".