1980827309 has 2 divisors, whose sum is σ = 1980827310. Its totient is φ = 1980827308.

The previous prime is 1980827269. The next prime is 1980827323. The reversal of 1980827309 is 9037280891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1820728900 + 160098409 = 42670^2 + 12653^2 .

It is a cyclic number.

It is not a de Polignac number, because 1980827309 - 2⁸ = 1980827053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1980827389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990413654 + 990413655.

It is an arithmetic number, because the mean of its divisors is an integer number (990413655).

Almost surely, 2^1980827309 is an apocalyptic number.

It is an amenable number.

1980827309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980827309 is an equidigital number, since it uses as much as digits as its factorization.

1980827309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 1980827309 is about 44506.4861452800. The cubic root of 1980827309 is about 1255.8821031929.

The spelling of 1980827309 in words is "one billion, nine hundred eighty million, eight hundred twenty-seven thousand, three hundred nine".