7783783781 has 2 divisors, whose sum is σ = 7783783782. Its totient is φ = 7783783780.

The previous prime is 7783783757. The next prime is 7783783783. The reversal of 7783783781 is 1873873877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7576135681 + 207648100 = 87041^2 + 14410^2 .

It is a cyclic number.

It is not a de Polignac number, because 7783783781 - 2¹⁸ = 7783521637 is a prime.

It is a super-2 number, since 2×7783783781² (a number of 21 digits) contains 22 as substring.

Together with 7783783783, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7783783781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7783783783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3891891890 + 3891891891.

It is an arithmetic number, because the mean of its divisors is an integer number (3891891891).

Almost surely, 2^7783783781 is an apocalyptic number.

It is an amenable number.

7783783781 is a deficient number, since it is larger than the sum of its proper divisors (1).

7783783781 is an equidigital number, since it uses as much as digits as its factorization.

7783783781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11063808, while the sum is 59.

The square root of 7783783781 is about 88225.7546354804. The cubic root of 7783783781 is about 1981.8171751500.

The spelling of 7783783781 in words is "seven billion, seven hundred eighty-three million, seven hundred eighty-three thousand, seven hundred eighty-one".