2783617561 has 2 divisors, whose sum is σ = 2783617562. Its totient is φ = 2783617560.

The previous prime is 2783617549. The next prime is 2783617609. The reversal of 2783617561 is 1657163872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2083009600 + 700607961 = 45640^2 + 26469^2 .

It is a cyclic number.

It is not a de Polignac number, because 2783617561 - 2⁷ = 2783617433 is a prime.

It is not a weakly prime, because it can be changed into another prime (2783617541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1391808780 + 1391808781.

It is an arithmetic number, because the mean of its divisors is an integer number (1391808781).

Almost surely, 2^2783617561 is an apocalyptic number.

It is an amenable number.

2783617561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2783617561 is an equidigital number, since it uses as much as digits as its factorization.

2783617561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 46.

The square root of 2783617561 is about 52759.9996304018. Note that the first 3 decimals coincide. The cubic root of 2783617561 is about 1406.7055120996.

The spelling of 2783617561 in words is "two billion, seven hundred eighty-three million, six hundred seventeen thousand, five hundred sixty-one".