81477103 has 2 divisors, whose sum is σ = 81477104. Its totient is φ = 81477102.

The previous prime is 81477101. The next prime is 81477133. The reversal of 81477103 is 30177418.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81477103 - 2¹ = 81477101 is a prime.

Together with 81477101, it forms a pair of twin primes.

It is equal to p_4750762 and since 81477103 and 4750762 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81477101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40738551 + 40738552.

It is an arithmetic number, because the mean of its divisors is an integer number (40738552).

Almost surely, 2^81477103 is an apocalyptic number.

81477103 is a deficient number, since it is larger than the sum of its proper divisors (1).

81477103 is an equidigital number, since it uses as much as digits as its factorization.

81477103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 81477103 is about 9026.4668060100. The cubic root of 81477103 is about 433.5227167598.

The spelling of 81477103 in words is "eighty-one million, four hundred seventy-seven thousand, one hundred three".