81677263 has 2 divisors, whose sum is σ = 81677264. Its totient is φ = 81677262.

The previous prime is 81677251. The next prime is 81677287. The reversal of 81677263 is 36277618.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81677263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81677203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40838631 + 40838632.

It is an arithmetic number, because the mean of its divisors is an integer number (40838632).

Almost surely, 2^81677263 is an apocalyptic number.

81677263 is a deficient number, since it is larger than the sum of its proper divisors (1).

81677263 is an equidigital number, since it uses as much as digits as its factorization.

81677263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The square root of 81677263 is about 9037.5473995991. The cubic root of 81677263 is about 433.8774296921.

The spelling of 81677263 in words is "eighty-one million, six hundred seventy-seven thousand, two hundred sixty-three".