2787692561 has 2 divisors, whose sum is σ = 2787692562. Its totient is φ = 2787692560.

The previous prime is 2787692539. The next prime is 2787692573. The reversal of 2787692561 is 1652967872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1700737600 + 1086954961 = 41240^2 + 32969^2 .

It is a cyclic number.

It is not a de Polignac number, because 2787692561 - 2²² = 2783498257 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (2787698561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1393846280 + 1393846281.

It is an arithmetic number, because the mean of its divisors is an integer number (1393846281).

Almost surely, 2^2787692561 is an apocalyptic number.

It is an amenable number.

2787692561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2787692561 is an equidigital number, since it uses as much as digits as its factorization.

2787692561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 53.

The square root of 2787692561 is about 52798.6037788879. The cubic root of 2787692561 is about 1407.3916132950.

The spelling of 2787692561 in words is "two billion, seven hundred eighty-seven million, six hundred ninety-two thousand, five hundred sixty-one".