82722781 has 2 divisors, whose sum is σ = 82722782. Its totient is φ = 82722780.

The previous prime is 82722769. The next prime is 82722793. The reversal of 82722781 is 18722728.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (82722769) and next prime (82722793).

It can be written as a sum of positive squares in only one way, i.e., 65367225 + 17355556 = 8085^2 + 4166^2 .

It is a cyclic number.

It is not a de Polignac number, because 82722781 - 2¹⁷ = 82591709 is a prime.

It is a super-2 number, since 2×82722781² = 13686116992747922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 82722781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82722721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41361390 + 41361391.

It is an arithmetic number, because the mean of its divisors is an integer number (41361391).

Almost surely, 2^82722781 is an apocalyptic number.

82722781 is the 4068-th centered decagonal number.

It is an amenable number.

82722781 is a deficient number, since it is larger than the sum of its proper divisors (1).

82722781 is an equidigital number, since it uses as much as digits as its factorization.

82722781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25088, while the sum is 37.

The square root of 82722781 is about 9095.2064847369. The cubic root of 82722781 is about 435.7208833441.

The spelling of 82722781 in words is "eighty-two million, seven hundred twenty-two thousand, seven hundred eighty-one".