1087781549 has 2 divisors, whose sum is σ = 1087781550. Its totient is φ = 1087781548.

The previous prime is 1087781509. The next prime is 1087781551. The reversal of 1087781549 is 9451877801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1084384900 + 3396649 = 32930^2 + 1843^2 .

It is a cyclic number.

It is not a de Polignac number, because 1087781549 - 2¹⁶ = 1087716013 is a prime.

Together with 1087781551, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1087781497 and 1087781506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1087781509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 543890774 + 543890775.

It is an arithmetic number, because the mean of its divisors is an integer number (543890775).

Almost surely, 2^1087781549 is an apocalyptic number.

It is an amenable number.

1087781549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1087781549 is an equidigital number, since it uses as much as digits as its factorization.

1087781549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 564480, while the sum is 50.

The square root of 1087781549 is about 32981.5334543438. The cubic root of 1087781549 is about 1028.4437959898.

The spelling of 1087781549 in words is "one billion, eighty-seven million, seven hundred eighty-one thousand, five hundred forty-nine".