1639980049 has 2 divisors, whose sum is σ = 1639980050. Its totient is φ = 1639980048.

The previous prime is 1639980047. The next prime is 1639980103. The reversal of 1639980049 is 9400899361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1617246225 + 22733824 = 40215^2 + 4768^2 .

It is a cyclic number.

It is not a de Polignac number, because 1639980049 - 2¹ = 1639980047 is a prime.

It is a super-2 number, since 2×1639980049² = 5379069122236084802, which contains 22 as substring.

Together with 1639980047, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1639979984 and 1639980011.

It is not a weakly prime, because it can be changed into another prime (1639980047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819990024 + 819990025.

It is an arithmetic number, because the mean of its divisors is an integer number (819990025).

Almost surely, 2^1639980049 is an apocalyptic number.

It is an amenable number.

1639980049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1639980049 is an equidigital number, since it uses as much as digits as its factorization.

1639980049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 1639980049 is about 40496.6671344692. The cubic root of 1639980049 is about 1179.2689259239.

The spelling of 1639980049 in words is "one billion, six hundred thirty-nine million, nine hundred eighty thousand, forty-nine".