1071819649 has 2 divisors, whose sum is σ = 1071819650. Its totient is φ = 1071819648.

The previous prime is 1071819647. The next prime is 1071819701. The reversal of 1071819649 is 9469181701.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 760932225 + 310887424 = 27585^2 + 17632^2 .

It is a cyclic number.

It is not a de Polignac number, because 1071819649 - 2¹ = 1071819647 is a prime.

It is a super-2 number, since 2×1071819649² = 2297594719964966402, which contains 22 as substring.

Together with 1071819647, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1071819599 and 1071819608.

It is not a weakly prime, because it can be changed into another prime (1071819643) 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, 535909824 + 535909825.

It is an arithmetic number, because the mean of its divisors is an integer number (535909825).

Almost surely, 2^1071819649 is an apocalyptic number.

It is an amenable number.

1071819649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1071819649 is an equidigital number, since it uses as much as digits as its factorization.

1071819649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 1071819649 is about 32738.6567989586. The cubic root of 1071819649 is about 1023.3885920380.

The spelling of 1071819649 in words is "one billion, seventy-one million, eight hundred nineteen thousand, six hundred forty-nine".