82772981 has 2 divisors, whose sum is σ = 82772982. Its totient is φ = 82772980.

The previous prime is 82772957. The next prime is 82773013. The reversal of 82772981 is 18927728.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70980625 + 11792356 = 8425^2 + 3434^2 .

It is a cyclic number.

It is not a de Polignac number, because 82772981 - 2¹⁸ = 82510837 is a prime.

It is a super-2 number, since 2×82772981² = 13702732767252722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82772941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41386490 + 41386491.

It is an arithmetic number, because the mean of its divisors is an integer number (41386491).

Almost surely, 2^82772981 is an apocalyptic number.

It is an amenable number.

82772981 is a deficient number, since it is larger than the sum of its proper divisors (1).

82772981 is an equidigital number, since it uses as much as digits as its factorization.

82772981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 44.

The square root of 82772981 is about 9097.9657616414. The cubic root of 82772981 is about 435.8090040328.

The spelling of 82772981 in words is "eighty-two million, seven hundred seventy-two thousand, nine hundred eighty-one".