81543367 has 2 divisors, whose sum is σ = 81543368. Its totient is φ = 81543366.

The previous prime is 81543317. The next prime is 81543391. The reversal of 81543367 is 76334518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81543367 - 2¹¹ = 81541319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81543317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40771683 + 40771684.

It is an arithmetic number, because the mean of its divisors is an integer number (40771684).

Almost surely, 2^81543367 is an apocalyptic number.

81543367 is a deficient number, since it is larger than the sum of its proper divisors (1).

81543367 is an equidigital number, since it uses as much as digits as its factorization.

81543367 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 37.

The square root of 81543367 is about 9030.1365991883. The cubic root of 81543367 is about 433.6402105671.

The spelling of 81543367 in words is "eighty-one million, five hundred forty-three thousand, three hundred sixty-seven".