81463111 has 2 divisors, whose sum is σ = 81463112. Its totient is φ = 81463110.

The previous prime is 81463087. The next prime is 81463147. The reversal of 81463111 is 11136418.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81463111 - 2⁹ = 81462599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81463181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40731555 + 40731556.

It is an arithmetic number, because the mean of its divisors is an integer number (40731556).

Almost surely, 2^81463111 is an apocalyptic number.

81463111 is a deficient number, since it is larger than the sum of its proper divisors (1).

81463111 is an equidigital number, since it uses as much as digits as its factorization.

81463111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 25.

The square root of 81463111 is about 9025.6917186441. The cubic root of 81463111 is about 433.4978991653.

Adding to 81463111 its reverse (11136418), we get a palindrome (92599529).

The spelling of 81463111 in words is "eighty-one million, four hundred sixty-three thousand, one hundred eleven".