81677423 has 2 divisors, whose sum is σ = 81677424. Its totient is φ = 81677422.

The previous prime is 81677413. The next prime is 81677441. The reversal of 81677423 is 32477618.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81677423 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81677413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40838711 + 40838712.

It is an arithmetic number, because the mean of its divisors is an integer number (40838712).

Almost surely, 2^81677423 is an apocalyptic number.

81677423 is a deficient number, since it is larger than the sum of its proper divisors (1).

81677423 is an equidigital number, since it uses as much as digits as its factorization.

81677423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 38.

The square root of 81677423 is about 9037.5562515538. The cubic root of 81677423 is about 433.8777130037.

The spelling of 81677423 in words is "eighty-one million, six hundred seventy-seven thousand, four hundred twenty-three".