82773781 has 2 divisors, whose sum is σ = 82773782. Its totient is φ = 82773780.

The previous prime is 82773763. The next prime is 82773797. The reversal of 82773781 is 18737728.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82719025 + 54756 = 9095^2 + 234^2 .

It is a cyclic number.

It is not a de Polignac number, because 82773781 - 2¹³ = 82765589 is a prime.

It is a super-2 number, since 2×82773781² = 13702997642071922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82773701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41386890 + 41386891.

It is an arithmetic number, because the mean of its divisors is an integer number (41386891).

Almost surely, 2^82773781 is an apocalyptic number.

It is an amenable number.

82773781 is a deficient number, since it is larger than the sum of its proper divisors (1).

82773781 is an equidigital number, since it uses as much as digits as its factorization.

82773781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131712, while the sum is 43.

The square root of 82773781 is about 9098.0097274074. The cubic root of 82773781 is about 435.8104080581.

The spelling of 82773781 in words is "eighty-two million, seven hundred seventy-three thousand, seven hundred eighty-one".