81234767 has 2 divisors, whose sum is σ = 81234768. Its totient is φ = 81234766.

The previous prime is 81234763. The next prime is 81234779. The reversal of 81234767 is 76743218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81234767 - 2² = 81234763 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 81234767.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81234763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40617383 + 40617384.

It is an arithmetic number, because the mean of its divisors is an integer number (40617384).

Almost surely, 2^81234767 is an apocalyptic number.

81234767 is a deficient number, since it is larger than the sum of its proper divisors (1).

81234767 is an equidigital number, since it uses as much as digits as its factorization.

81234767 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 81234767 is about 9013.0331742427. The cubic root of 81234767 is about 433.0924834499.

The spelling of 81234767 in words is "eighty-one million, two hundred thirty-four thousand, seven hundred sixty-seven".