1982816639 has 2 divisors, whose sum is σ = 1982816640. Its totient is φ = 1982816638.

The previous prime is 1982816603. The next prime is 1982816663. The reversal of 1982816639 is 9366182891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1982816639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1982810639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991408319 + 991408320.

It is an arithmetic number, because the mean of its divisors is an integer number (991408320).

Almost surely, 2^1982816639 is an apocalyptic number.

1982816639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1982816639 is an equidigital number, since it uses as much as digits as its factorization.

1982816639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 53.

The square root of 1982816639 is about 44528.8293019253. The cubic root of 1982816639 is about 1256.3023868520.

The spelling of 1982816639 in words is "one billion, nine hundred eighty-two million, eight hundred sixteen thousand, six hundred thirty-nine".