1047678661 has 2 divisors, whose sum is σ = 1047678662. Its totient is φ = 1047678660.

The previous prime is 1047678659. The next prime is 1047678701. The reversal of 1047678661 is 1668767401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1030089025 + 17589636 = 32095^2 + 4194^2 .

It is a cyclic number.

It is not a de Polignac number, because 1047678661 - 2¹ = 1047678659 is a prime.

Together with 1047678659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1047678631) 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, 523839330 + 523839331.

It is an arithmetic number, because the mean of its divisors is an integer number (523839331).

Almost surely, 2^1047678661 is an apocalyptic number.

It is an amenable number.

1047678661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1047678661 is an equidigital number, since it uses as much as digits as its factorization.

1047678661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 1047678661 is about 32367.8646345415. The cubic root of 1047678661 is about 1015.6467881287.

The spelling of 1047678661 in words is "one billion, forty-seven million, six hundred seventy-eight thousand, six hundred sixty-one".