1916832649 has 2 divisors, whose sum is σ = 1916832650. Its totient is φ = 1916832648.

The previous prime is 1916832647. The next prime is 1916832661. The reversal of 1916832649 is 9462386191.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1743647049 + 173185600 = 41757^2 + 13160^2 .

It is a cyclic number.

It is not a de Polignac number, because 1916832649 - 2¹ = 1916832647 is a prime.

Together with 1916832647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1916832647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 958416324 + 958416325.

It is an arithmetic number, because the mean of its divisors is an integer number (958416325).

Almost surely, 2^1916832649 is an apocalyptic number.

It is an amenable number.

1916832649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1916832649 is an equidigital number, since it uses as much as digits as its factorization.

1916832649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 49.

The square root of 1916832649 is about 43781.6473993385. The cubic root of 1916832649 is about 1242.2091751056.

The spelling of 1916832649 in words is "one billion, nine hundred sixteen million, eight hundred thirty-two thousand, six hundred forty-nine".