1982728091 has 2 divisors, whose sum is σ = 1982728092. Its totient is φ = 1982728090.

The previous prime is 1982728073. The next prime is 1982728093. The reversal of 1982728091 is 1908272891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1982728091 is a prime.

It is a super-3 number, since 3×1982728091³ (a number of 29 digits) contains 333 as substring.

Together with 1982728093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1982728093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991364045 + 991364046.

It is an arithmetic number, because the mean of its divisors is an integer number (991364046).

Almost surely, 2^1982728091 is an apocalyptic number.

1982728091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1982728091 is an equidigital number, since it uses as much as digits as its factorization.

1982728091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 1982728091 is about 44527.8350136182. The cubic root of 1982728091 is about 1256.2836853883.

The spelling of 1982728091 in words is "one billion, nine hundred eighty-two million, seven hundred twenty-eight thousand, ninety-one".