1982591869 has 2 divisors, whose sum is σ = 1982591870. Its totient is φ = 1982591868.

The previous prime is 1982591843. The next prime is 1982591899. The reversal of 1982591869 is 9681952891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1968075769 + 14516100 = 44363^2 + 3810^2 .

It is a cyclic number.

It is not a de Polignac number, because 1982591869 - 2¹¹ = 1982589821 is a prime.

It is a super-2 number, since 2×1982591869² = 7861341038049826322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1982591839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991295934 + 991295935.

It is an arithmetic number, because the mean of its divisors is an integer number (991295935).

Almost surely, 2^1982591869 is an apocalyptic number.

It is an amenable number.

1982591869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1982591869 is an equidigital number, since it uses as much as digits as its factorization.

1982591869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799360, while the sum is 58.

The square root of 1982591869 is about 44526.3053598656. The cubic root of 1982591869 is about 1256.2549140209.

The spelling of 1982591869 in words is "one billion, nine hundred eighty-two million, five hundred ninety-one thousand, eight hundred sixty-nine".