81734423 has 2 divisors, whose sum is σ = 81734424. Its totient is φ = 81734422.

The previous prime is 81734407. The next prime is 81734459. The reversal of 81734423 is 32443718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81734423 - 2⁴ = 81734407 is a prime.

It is a Sophie Germain prime.

It is equal to p_4764821 and since 81734423 and 4764821 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81734423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81734483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40867211 + 40867212.

It is an arithmetic number, because the mean of its divisors is an integer number (40867212).

Almost surely, 2^81734423 is an apocalyptic number.

81734423 is a deficient number, since it is larger than the sum of its proper divisors (1).

81734423 is an equidigital number, since it uses as much as digits as its factorization.

81734423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 32.

The square root of 81734423 is about 9040.7092089061. The cubic root of 81734423 is about 433.9786192190.

The spelling of 81734423 in words is "eighty-one million, seven hundred thirty-four thousand, four hundred twenty-three".