2780973989 has 2 divisors, whose sum is σ = 2780973990. Its totient is φ = 2780973988.

The previous prime is 2780973913. The next prime is 2780974003. The reversal of 2780973989 is 9893790872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1899477889 + 881496100 = 43583^2 + 29690^2 .

It is a cyclic number.

It is not a de Polignac number, because 2780973989 - 2⁸ = 2780973733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2780972989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390486994 + 1390486995.

It is an arithmetic number, because the mean of its divisors is an integer number (1390486995).

Almost surely, 2^2780973989 is an apocalyptic number.

It is an amenable number.

2780973989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780973989 is an equidigital number, since it uses as much as digits as its factorization.

2780973989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13716864, while the sum is 62.

The square root of 2780973989 is about 52734.9408741491. The cubic root of 2780973989 is about 1406.2600599669.

The spelling of 2780973989 in words is "two billion, seven hundred eighty million, nine hundred seventy-three thousand, nine hundred eighty-nine".