81461333 has 2 divisors, whose sum is σ = 81461334. Its totient is φ = 81461332.

The previous prime is 81461327. The next prime is 81461381. The reversal of 81461333 is 33316418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73582084 + 7879249 = 8578^2 + 2807^2 .

It is a cyclic number.

It is not a de Polignac number, because 81461333 - 2⁶ = 81461269 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81461296 and 81461305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81464333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40730666 + 40730667.

It is an arithmetic number, because the mean of its divisors is an integer number (40730667).

Almost surely, 2^81461333 is an apocalyptic number.

It is an amenable number.

81461333 is a deficient number, since it is larger than the sum of its proper divisors (1).

81461333 is an equidigital number, since it uses as much as digits as its factorization.

81461333 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 29.

The square root of 81461333 is about 9025.5932215007. The cubic root of 81461333 is about 433.4947453252.

The spelling of 81461333 in words is "eighty-one million, four hundred sixty-one thousand, three hundred thirty-three".