81832277 has 2 divisors, whose sum is σ = 81832278. Its totient is φ = 81832276.

The previous prime is 81832243. The next prime is 81832291. The reversal of 81832277 is 77223818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72352036 + 9480241 = 8506^2 + 3079^2 .

It is a cyclic number.

It is not a de Polignac number, because 81832277 - 2⁶ = 81832213 is a prime.

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 81832277.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81837277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40916138 + 40916139.

It is an arithmetic number, because the mean of its divisors is an integer number (40916139).

Almost surely, 2^81832277 is an apocalyptic number.

It is an amenable number.

81832277 is a deficient number, since it is larger than the sum of its proper divisors (1).

81832277 is an equidigital number, since it uses as much as digits as its factorization.

81832277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 38.

The square root of 81832277 is about 9046.1194442700. The cubic root of 81832277 is about 434.1517392919.

The spelling of 81832277 in words is "eighty-one million, eight hundred thirty-two thousand, two hundred seventy-seven".