1978611413 has 2 divisors, whose sum is σ = 1978611414. Its totient is φ = 1978611412.

The previous prime is 1978611377. The next prime is 1978611469. The reversal of 1978611413 is 3141168791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1816634884 + 161976529 = 42622^2 + 12727^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1978611413 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1978671413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989305706 + 989305707.

It is an arithmetic number, because the mean of its divisors is an integer number (989305707).

Almost surely, 2^1978611413 is an apocalyptic number.

It is an amenable number.

1978611413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978611413 is an equidigital number, since it uses as much as digits as its factorization.

1978611413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 41.

The square root of 1978611413 is about 44481.5850999040. The cubic root of 1978611413 is about 1255.4136217524.

The spelling of 1978611413 in words is "one billion, nine hundred seventy-eight million, six hundred eleven thousand, four hundred thirteen".