81477133 has 2 divisors, whose sum is σ = 81477134. Its totient is φ = 81477132.

The previous prime is 81477103. The next prime is 81477163. The reversal of 81477133 is 33177418.

It is a balanced prime because it is at equal distance from previous prime (81477103) and next prime (81477163).

It can be written as a sum of positive squares in only one way, i.e., 59028489 + 22448644 = 7683^2 + 4738^2 .

It is a cyclic number.

It is not a de Polignac number, because 81477133 - 2⁵ = 81477101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81477103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40738566 + 40738567.

It is an arithmetic number, because the mean of its divisors is an integer number (40738567).

Almost surely, 2^81477133 is an apocalyptic number.

It is an amenable number.

81477133 is a deficient number, since it is larger than the sum of its proper divisors (1).

81477133 is an equidigital number, since it uses as much as digits as its factorization.

81477133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 34.

The square root of 81477133 is about 9026.4684677896. The cubic root of 81477133 is about 433.5227699678.

The spelling of 81477133 in words is "eighty-one million, four hundred seventy-seven thousand, one hundred thirty-three".